This is probably one of the best kept secrets about Mexico City, where you would never know you…read morewere if you visited here. When I think of Mexico City, I think of an overcrowded and overpolluted city of 22 million people where is can take more than an hour to drive one mile.
This particular place provides a great escape from the madness. If you go all the way to the top, there's an ex-convent ($17 MXN admission) and great biking and running trails that go for miles. There's a charge of $20 MXN (about $1 USD) if keep going up beyond the roughly 3/4 mark, or you can park before that and just walk around.
I do not recommend this park for road biking off the trails. The curves are very blind and dangerous, people still drive like maniacs even though they're in a park and therefore, you're just an accident waiting to happen. Stick to the trails and you'll be all right. The extent of the wildlife we observed were two oversided black squirrels, which may not have been squirrels after all.