I'm sure there are many places to camp in that area. There's a few Parks within 20-30 mins. IMO it's only worth staying for the weekend IF it's summer. Go up on a Fri after work, set up your camping gear, chill, Saturday morning take cruise around Centralia, do a little wheeling, then go to Knoebels afterwards for the night. It's a fun as heck experience.
I have been to knobels before and it is a ton of fun. I will be back when it starts getting warmer so that should work out good. looks like a military mask...they all do the same thing i guess. anyway thanks for the advice on when to go. I think I have seen your xj around town also.