Literally can't think of anything apart from drinking that he's too young for at 17?
You can do pretty much anything??
Museums, art galleries, city tours, exhibitions, concerts, plays, gigs, festivals, historic houses, castles, village fairs, steam rallies, aquarium,. zoos, clip and climb, swimming, lakes, walks, hikes mini golf, rock climbing, fishing, bike rides, beach, fairground, theme park, cinema, bowling, arcades ...
Sure, he can't do softplay or drinking....but he can do pretty much anything he could do when he was 12 ... And can do pretty much anything that an adult could do.
I can't understand why you can't think of anything or why you think he's at an "in-between" age???