There are some nice trails up there. It has been many years since I have been there. The Forest Rangers will have maps. I have a Wrangler that was on 35 MTRss and ARBs front and rear, among other mods when I wheeled there. Some of the trials I wouldn't want travel on alone even with a modified rig. I got through everything with my jeep but had to use my winch on occasion and did a little damage here and there. I believe they have some sort of rating system at the beginning of each trail.
Get a map and pay attention to the difficulty of the trails and you will be fine.
Back in the day some of the ski resort would let you rent mountain bikes, take you up on ski lift and let you ride down the ski runs, of course this was during the none snowy months. That is something you may want to check into.