So, our autistic 7 year old (mostly non-verbal) rarely plays with any particular thing for a long time, but the teachers at school put him in a VR set and he watched water for 45+ minutes.

We're thinking of getting one for his birthday. He hardly wants anything, so it'd be nice to do something special. Any recommendations? Thinking a meta quest 2?

I don't think he generally understands or cares about the gaming aspects of things, so we're more interested in open worlds, especially aquatic ones, that he could get immersed in.
@ZachWeinersmith I'm a sucker for sandbox games! I can definitely relate.