WMF is a fun place to ride, especially if you want to work on your cardio and do some LSD work. There are approximately 35 mi of trails in and around the WMF. Sadly, most only experience 20-30% of the Park.
The riding is not exciting and most of the trails you can drive a car on but it's fun. I take my 12 yr old son here a lot because he is still learning how to ride trails, and WMF provides just enough technical trails for him to handle.