Visit tiny museums.
I stumbled across this hobby a few years ago. Whenever I'm in some place new, I run a search on google maps for "museums" and try to find the smallest, most niche topic possible.
It's a pretty small time commitment - a small museum can often be explored in 30-60 minutes - and it's incredibly rewarding.
The smaller the museum is, the more likely you'll meet the person who set it up. And that's guaranteed to be a great conversation no matter what the subject of the museum is.
A couple of months ago I started a website to share details of the museums I've explored. So far I've managed to post a new one every day, and I've still got a backlog of about 50.