First get rid of the alcohol it makes all parties terrible. Second invite all his freinds including family (parents cousins grandparents siblings) bring good food that is a key part. Have lots of good safe games (board games card games night games) and just have fun. Give him a memory that he can look back to and say I can have fun even when it's not wild stupid and crazy or involves beer. That will make the biggest impression on him then anything else.

My friend is leaving in a month for boot camp and we want to have a party for him before he goes. Kinda like a last wild night before he can't really do it anymore. He's eighteen so there will be underage drinking. Ages of other guests varies from 18-22. The party will be at a camp site with a pond we can swim in, a zip line, and teepees. It's a private site in the middle of the woods so nobody will hear it. What can we do to make it a great and safe partY?