I've always said that when I retire, I'd like to buy an RV and drive the backroads of Japan, and of the US. Just explore. Drive, explore, take photos, talk to people. Avoid the highways and only take local roads. That'd be a fun retirement.
(My wife doesn't agree)
My wife would actually love to do that. She wants to turn a bus into an office so she can do mobile counseling and social work service. She says I get half the bus to do mobile tech support.