There are many miles of two-way single-track trails in the park at several levels of difficulty. The Pass Mountain Trail should challenge intermediate to advanced riders. The Cat Peaks Trail isn't that tough but it has a nice little climb and intermediate riders should have fun with the moderate technical features. For me the Cat Peaks Pass trail isn't really ride-able for its entire length although an advanced or expert rider may find it possible or even fun. Most of the rest of the trails are okay for beginners for most of their length. If you are unsure then just walk your bike through the washes. This system gets extremely hot in the summer. During this season you should consider riding in the early morning hours or in the late afternoon. Be sure to bring lots of water on your rides. A first aid kit is a good idea too, collisions with a cactus can hurt a lot. For your first visit it is a good idea to enter the park from the Ellsworth entrance. The day use fee is $6 per car but you get a paper map and can spend hours exploring the park on a mountain bike on your first visit. There are also seven access points located around the perimeter of the park. Learn more about these by checking out the individual rides listed here.