Honestly, Chumash isn't that fun in my opinion. It’s a pretty steep climb and a boring descent. And Hummingbird is in pretty bad disrepair these days. Really chewed up and eroded, loose, and hard to follow the lines from everyone blowing the corners and switchbacks, also, a lot more hikers on Hummingbird.
There are better trails up there.
Park across the freeway from Rocky Peak Park Trailhead. Pedal and/or hike (depending on your fitness level) up to where the fire road meets Hummingbird, take a breather BUT continue past Hummingbird.
There are two other trails up there by the name of The Grudge and Undertow, and possibly a third new one by now, not sure... use Trailforks App to find them.
Be aware that these are expert level trails. So be ready for some serious tech, and a few white knuckle moments if you take either with some speed your first time. That being said I’d argue they’re less dangerous than Hummingbird is in its current state.
Put a bell on your bike, don’t be a dick to people (that means yielding and other basic etiquette) and have fun!
