VR set-up for my elderly, sick Dad that isn't game-focused, but rather wandering around / experiencing nature while staying seated in his recliner? Which system has the the best content for that?

EDIT: THANK YOU everyone for your wonderful support and guidance!!! I am SO grateful

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My Dad is chair-bound, and is in his last months with stage 4 cancer. Is there a system that could offer a lot of beautiful content? Nature-based type things, so he can feel like he's wandering around, maybe he could experience flying?

Even just sitting by a peaceful lake! Strolling along a forest trail, which he used to love...

I'm a total noob so i'm not even sure if people can "move" in virtual realities if they can't stand up IRL and walk?

We do not have a gaming PC, nor could i get his regular PC into the living room, so this would have to be a laptop situation or standalone system i can set up by his recliner... (Alternatively, if they still do those headsets that attach/adapt your phone, he has an iphone.)

Thank you for any guidance!!! I'm really not sure where to begin. I could spend maybe up to $750??