Gets bonus points for being close to downtown. It can be really busy in the weekends and afternoons, but if you go before work in the morning you can have the whole trail system to yourself.
The trails can be really challenging especially for new riders. Although I haven't tried it before, I think they do group rides on Tuesday evenings in the summer.
My favourite trail is catalyst. It can be a bit tricky to find the first time you go. You have to go through the "ridge" (which is the first trail) which ends in a parking lot. You have to head down the road and make a left onto a trail when you get close to the creek (I think it is taylor creek, but not sure). Follow that trail until you get to a switch-back and then head back east when you get to the top of the switchback (head away from the footbridge).
Please wear a helmet if you are going. As I said, these trails can be tricky, and I have hurt myself a couple of times with bad bails. Things could have been really bad if I wasn't wearing a helmet.