Not a very good ride today

Today I wen to el Ajusco (in Mexico city) This ride was full of bummers.
Everything was going well. I climbed for about 50 min until I reached the singletrack which I usually go through on my short saturday rides (2 to 2 1/2 hours). This singletrack it very fun, although it has a hole in the center on some parts because of the rain season. Well, today it wasn't that fun. Since the beggining I noticed very large (and fresh) piles of cr4p. I figured it was from some horse, although horses usually don´t go there. As I continued down the singletrack, I noticed that the trail was becoming more and more deteriorated. There were still piles of poo and hoof marks. Also, the dirt was very loose and powdery, making it hard to ride there. I continued down the trail and I started hearing some very loud "moooo"s and leaves rustling. I kinda felt like i was on jurassic park . I finally reached the source of the "mooo"s and I discovered they were about 8 cows totally destroying the trail. They were eating the plants and trampling on them. There were broken branches everywhere, which got stuck into my wheels every 10 meters. I could not believe someone had left their cows free to eat and trample all around the trails. Anyway, I took a (kinda boring) detour to avoid the cows. Most of my downhill part of the ride had been ruined, but I thought "oh well, I can still go to the 4x track and have some fun". Ive been visiting that 4x recently, since I want to improve in some light jumps (I would buy a freeride bike, but im 15 and I can't afford one ).
Photo of the 4x (stole from rzozaya )
Well i was wrong if I thought I could ride the 4x freely for the half an hour I had left. I could only run through it 3 or 4 times when a guy approached me. He said to me that the track was private and that soon they would start to ask for money to use it. The entrance fee will be 20 pesos (a bit less than 2 bucks), although you already have to pay 20 pesos to get inside the park (Which has 150 km of trails. The 4x is about 200m long). The thing is, few people go to the park just to ride the 4x. The vast majority of them only ride it on their way out (including the downhillers). I told him I didn't have any money left, so he let me ride it one more time and I left. Oh and by the way, I also lost my minitool. ] End of rant.