Haspin is a really fun place...but be very careful there if you use your Jeep as your DD. It's really easy to roll vehicles in there...but if you like to wheel hard, you'll like it. I've never taken my Jeep anywhere (not til I pay the dang thing off...LOL), but I used to ride quads there.
Last time I was there, it was $15/person and that includes camping until 9am the following morning...they also don't have any rules regarding alcohol consumption so you can go wheeling, get wasted, wheel some more like a complete idiot (not sposed to wheel after dark, but I've been told most people do anyway). Just gotta keep in mind some of the people you come across may be drunk...so if somebody is flying at you, get out of the way...I've heard people do get pretty seriously injured there multiple times a year, but dunno if it's true (wouldn't surprise me though).
Here's a couple videos I took from our trips there on quads... at least you can get an idea of the terrain.
YouTube - Four-wheeling
YouTube - Four-Wheeling at Haspin Acres