I see the reviews are pretty old, so I will do a quick review to update the trail conditions.
This is a still a beautiful trail with lots of mature trees making it feel like the east coast. The gas company has done a lot of work on the trail over the last couple years so the main trail down the center is more of a fire road through the trees. There has not been any water over the main trail recently. It seems they diverted the streams with concrete mats. While the main trail is not as fun as it once was, there is now a great network of single track trails through the woods on either side of the main trail. These trails are really fun with some cool drop offs, some trees to hop over and even a couple narrow wood bridges. These trails have really been evolving over the last year or so, and my hat goes off to whoever has been putting the work into grooming them. Going down they are all connected, oftentimes crossing the main trail. So much fun, especially at night. It does not feel like Southern California down there because it is so lush and green. Climbing back up to Sullivan Ridge is some work. Good riders can climb out in 35 or 40 minutes. I stick to the main trail climbing out. It doesn't get steep until like the last third of the ride, but when it gets steep it's a good climb.

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I will usually start on Reseda at Caballero...climb up Cab to Mulholland...east on Mulholland for a couple of miles to the Sullivan Ridge gate... Head down Sullivan Ridge about half a mile to Sullivan Canyon on the left. NOTE: Along the ridge on the left before Sullivan Canyon there is a single track that goes up and down the hills parallel to the fire road. Much more interesting. There is also a single track off of Mulholland 30 years east of cab called Farmers. This is really nice and will cut out some of the Mulholland fire road up to Sullivan Ridge. The entire ride from Cab including down Sullivan Canyon and back up is only about 16 miles. For a longer ride sometimes I will start at the Topanga State Park entrance at Entrada off of Topanga Canyon. From there I climb to the Hub and go left on the fire road all the way to the top of Caballero and continue to Sullivan. That ride is 25 or 26 miles.

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Will Rogers (Backbone), J-Drop, Squirrel Cage

The trail is completely covered by the stream. Usually you just cross the stream 7 or 8 times and get a little wet during the winter, but I rode yesterday 3/28/11 and literally was pedaling down the canyon in the middle of the stream for 40% of the 5 miles because the stream has taken over the road (after the huge rain we had on 3/20). It was fun and interesting, but different and slower than normal. The stream just made a mockery of PG&E's work with the pavers. The pavers are working in parts but in other parts the stream washed away 3 feet worth of road.

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Down the canyon, find as much single track as you can.

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Backbone trail from Temescal Ridge to Will Rodgers is always great, and not crowded until you get to the oak tree.

I never knew the single track version, but I got to ride it last week, post flood. I guess is was fairly wet for a Socal trail but very ridable in that condition. Pavers are a little weird. I rode at night. Over all I enjoyed it on my SS.

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Up Sullivan Canyon from Queensferry to Sullivan Ridge. Turn left on Sullivan Ridge and did the adjacent single track all the way along Sullivan Ridge to a paved road. Go left on the paved road and look for a steep single track dropping back to Sullivan Cyn.

Just rode this on Friday and was stunned- it is only a shell of its former self. Someone, the county or gas company or whoever, absolutely destroyed what was once a jewel of a trail. All the old singletrack has been leveled into boring double track and there are several sections of strange concrete pavers/spacers that are actually dangerous to ride over because your wheels get caught between them. It was as if someone really did not want bikers in there because they took all the fun out of it. Very disappointing. I used to rate this a clear 5 and now a 2 is charitable.

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Rode from Westridge fire road in Brentwood up to Nike tower and across dirt Mulholland then down Sullivan Canyon.

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Cheseboro, Malibu Creek, Sycamore Canyon-Guadalasca

Flowy moderate pitch singletrack through shady canyon followed by relatively short steeper and rockier climb up to ridge. Not sure of the distance but it takes me about 40 minutes to climb going along at a decent clip in the middle chainring.

Can be as aerobically challenging as you want to make it going up but doesn't require exceptional fitness to enjoy. Strong riders will do the whole thing in the middle chainring.

It's not a technical descent but fun with good flow. You can get in trouble if you get don't keep a handle on your speed but traction is good and there are no huge obstacles that can't be ridden around. There are few small drops to flat but there are paths around them if you don't want to hit it. Ride in control and slow down before blind corners out of respect for other trail users.

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I typically start at the bottom and ride this up and connect to Will Rogers/Backbone trail via dirt mulholland and temescal fire rd for a nice 20 mile loop that's probably 2/3 singletrack. And it's the only way that I've found to do a good chunk of your climbing in the Santa Monica Mtns. in the shade.

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Will Rogers/Backbone and various singletracks that run along Sullivan Fire Road and dirt Mulholland. Backbone trail near Kanan Rd. is another good singletrack up the coast 15 miles.

This was my first time riding this trail and it was great. You can get a lot of speed on the canyon floor and there are a good amount of technical sections also.

This was a 10am weekday ride and I did see about a dozen hikers (two with about 10 dogs), one horse, and one uphill rider in the canyon.

NOTE: I think the canyon should be a ONE WAY DOWN ride only! The speed that one can get and limited forward visibility could result in a nasty accident if not careful. It would be very dangerous to ride up the canyon. Bells are always good to advise others you are coming.

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I started from the Santa Monica side and rode up the Westridge fireroad to the Nike Missil silo at Mulholland, then west on Mulholland to the Sullivan fireroad and down the canyon. This is nice as it gets the uphill done first and it's all fun going down.

Rode on Friday 02.01.08. Westridge fire road up, Sully down. Lots of water in the canyon. It was fun but not very fast. Stream crossings too numerous to count. Actually had to ride in the stream in several places. Will probably wait until it drys out before I ride it again.

Overall rating was low due to the water. Normally I'd rate it a 4.

This is easily one of the best trails around. Super fast (without hikers or uphillers) mostly singletrack easy slope down through an awesome tree lined canyon. I would say this trail is almost as technical as you want to make it, very speed dependent. Beginners will have no problems taking it slow and steady. For faster riders there are plently of things to rail and jump off of and even a few drops, one is about 4ft with a flat landing so unless you are on a motocross bike you might break your ride or yourself. Just blasting or hopping all of the stumps and logs on this trail is rad! Can easily get up to 30-35mph for a lot of this trail, but watch for hikers and uphillers, there are a lot. This trail kicks at night also.

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Top of reseda blvd. east on drt mulholland FR for about 3-4 miles up. Turn right at Sullivan ridge gate. Take sullivan ridge about 1-2 miles. Take hard left onto sullivan canyon downhill. ride it. at the bottom climb the residential streets to westridge. Take westridge about 4.5 miles up to nike base at drt mulholland. Take drt mulholland west(left) back to top of reseda.

I love this trail. my friend took me out last week after work and I had a blast. Not too technical some logs and mild drop mostly smooth single track with fun obstacles along the way. I'm coming back again next week.

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Bottom of Reseda, climb up Caballero and turn left climb another 2.5 miles hook up Sullivan Ridge then have a nice time going down hill. at the bottom you can climb back or hike the bike up the luge and climb Sullivan Ridge and back to Caballero.

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Backbone

The 1x is sicker than ever!