Suggestions for party activities (in the woods)?
Build a campfire near a bench, or even a couple of benches. Get some beers, joints if you into that kind of stuff. Let them bring themselves and their girlfriends if they want to come along. Send location via whatsapp so everyone can find it. Get a ball to play some soccer, maybe a rope between two trees to play some volleyball and smack each other in the head. Done deal!