I wheeled that area last weekend. The Snake Lake trail is good, as is the Deer Lake trail. Most of the trails are easy; however, there are a few REALLY GOOD obstacles along the way. There is a killer waterfall-type obstacle along the Deer Lake trail that will require front and rear lockers. Also, there is an area of very cool Petryglyphs (I think that's what they are called) with rock designs dating back thousands of years (or so the sign said). It was worth seeing.
Take some warm clothes. We left 100-degree temps in the Valley and got rain/hail up the hill. Also, the mosquitos are mutant, so take bug spray. Some of the water in the lakes was surprisingly warm, so swimming is on the menu. We were impressed, as fuel/food is close by, and there is running water at one of the campgrounds for re-stocking camp.
A word of advice though (we found out the hard way)...The area is huge for mountain bike racing and they will shut down roads that lead to the trails for races. You can check in Sierra City to see if anything is going on; and if so, what time you need to get to the trail to avoid a road closure.
Good luck!