So a few friends and I are planning to go camping for a weekend down in the Shawnee Forest (southern Illinois) in the near future. We've gone a couple times before and had good times at a couple locations (even a spokee encounter we want to look into more). I'm curious what everybody's favorite areas of the Forest are down there. I'd like to get a fair bit away from the roads/civilization and really be "out there", as much as you can in Illinois.I'd also love to see some really neat natural formations and a good adventure. Even better would be something like some abandoned/historic buildings out there we could 'urban' explore at.

tl;dr: Favorite place in Shawnee National Forest far-ish away from other people?