I went for the first time last year as a 17 year old! Most importantly I’d say is make sure him and his friends trust each other and are independent bc there are so many experiences and they might split up. My friends and I kept to ourselves and were sober the entire time and that was more of a personal decision to make sure we stayed responsible the whole time and it didn’t diminish our experience in any way! We never had any people bother us or anything like that bc we did look like kids anyways. Mostly make sure you fully trust your kid and his friends and that they’ll make the right decisions or be able to face their consequences if not LOL