My grandparents just bumped their volunteering from weekends to weekdays. Then my Boomer parents switched to leisure activities and travel (they stopped volunteering when they retired). I prefer my grandparent's retirement, but now that NGOs got professionalized and became extremely political that is a no-go for me. I didn't like to be bossed around by a 30yo narcissist driven by maxing out his EOY presentation (to keep their comfy job).
I'm considering to retire in a small town where distant relatives live and hopefully get busy by volunteering there somehow. But it's never that simple.
My fantasy is maybe to start a one person cafe operation and manage overheads.
Unfortunately most retail space in the US is way too oversized to make that kind of operation work.
Not sure what the current food truck climate is, but that angle might be a way to get something compact and 1-2 person sized. You could get a small caravan/trailer or stand and hire out for parties purely on weekends or just Saturdays to get it started ahead of schedule.