A slack line? Maybe over budget
Stuff to build skate features, or wax for waxing curbs
If he lives by snow, a park rake is super cool for building snow features. It like makes a perfect jump for you.
G-form (knee)pads maybe lame, but by far the most comfortable protection I’ve ever worn.
A knife, 10 year old me would spend hours widdling sticks, trying to make wooden swords and stuff
3d printed nerf guns are amazing now. If you have access
Sounds like people ain’t never been to the northeast kingdom.