OK - with your 4.0, first school for outdoors and his pursuits I think of is U of Arizona. The $32K merit is a bonus - with the 4.0.
Others - Colorado schools: CU Boulder, School of Mines, Colorado State. Additionally, U of Washington, Utah, Wyoming, UTK, UVM, and Arkansas would all be good for rock climbing and hiking.
What kind of rigor does he have? You mentioned Honors but how about AP?
Size wise - there’s a big differential between the schools you list. Even the UCs are different so what about them appeals to him - or which - it can’t be all…well it could be but it’s doubtful.
That said - if he’s interested in biomedical or civil, then he really doesn’t know - and at 17, he doesn’t need to know…but I’d lean toward a school with biomedical just in case.
Good luck.