Tickets/Voucher for a rock climbing centre could be up his alley.
If you want something that will last you could get him a powder bag, or his first Carabiner as well.
Be prepared that the climbing place might not let him use the Carabiner in conjunction with their equipment though, so it might sit around until he got his own harness if he ever went that far. Powder bag would be all good.
Tickets/Voucher for a rock climbing centre could be up his alley.
If you want something that will last you could get him a powder bag, or his first Carabiner as well.
Be prepared that the climbing place might not let him use the Carabiner in conjunction with their equipment though, so it might sit around until he got his own harness if he ever went that far. Powder bag would be all good.