I've done this. One dude fell in the campfire, but he didn't get burned. We swung from grapevines, and chopped up firewood easy as hell because accid makes you super man. we chopped down a few trees and uprooted a few as well. It makes you go "Raah!" and fuckin feel like a man. I ended up with a concusion that night, and a concusion on acid is not cool.
But getting a bunch of people together to trip acid in the woods together, with a decent camp fire, and battery powered spot lights, and you can have all kindsa fun.
Me and my brothers hunted each other through the woods for hours, and would jump out and attack each other. Two of us fell over a hill into a fucked up briar patch.
Good times, good times...