My neighbour is partially sighted and is THE liveliest most non-stop character. She is constantly going to gigs, musicals, sporting events and such things that she loves. As she is registered, in the UK a lot of events that she attends, her "carer" (read- whoever she wants to take) comes along for free, so that could really help if money is an issue.

My girlfriend is fully cited. We love going out to eat, going to the movies when they have proper working audio description headsets, checking out local concerts or festivals and taking full advantage of ADA platforms for seating, same with musicals and performances, making sure to get ADA discount seats.

Why not go for walks or light hikes? Tandem bicycles? It really ultimately depends on what you have available to you wherever you live… And unfortunately being in high school with no income really doesn't help anything. Have video or board game nights? Learn how to play pool? Netflix and chill with audio description? It really depends on how far out of his comfort zone he's willing to head.