I've been there. Trails go from level 1-5. I'd start off with a level 1 trail and work your way up, especially with relatively "street" tires. You can pick up a map when you check in and plan your route. Go with a buddy in another vehicle if you can. All of the trails are well-marked and there is a lot there for every level of rig. Last time I was there we led a group of stock/newbies on some level 2s but only one had IFS and everybody had more offroad-ish tires. There's a "playground" with mud puddles and obstacles to climb over, but I'd be careful on them with a stock rig.
It's a fun place for sure! The facilities are really clean and you can buy a wide variety of hot food there.
Here are some pics from when I was there in April. The weather was cold and miserable for the last couple of days but I think everybody had a good time anyway. the silver Grand Cherokee is mine and most of these pics are on level 2-4 trails.
52 Willys CJ3a: stock-ish (his)**95 ZJ Laredo 4.0: removable doors, longarm, 8.8 rear, leaks, squeaks, dents, dings, etc (ours)**03 TJ Rubicon: longarm, body lift, 33" Duratracs- SOLD**05 LJ Rubicon: stock (MINE!)