This is a repeat but most areas have historical societies, and they usually have websites. I find that most of the websites have very little info, but you can stop in or email/call. These people LOVE to talk...when there's not a pandemic going on they also have meetings and events. Stop in and ask around. My tiny little town even has a museum with local history and artifacts, and I've learned a lot there. Also, find an old timer who has lived in the area their whole life...and just ask where the social hotspots used to be. By doing this I learned that a commercial property that my in-laws own used to have a dancehall onsite. I was able to find remnants of the old foundation in the overgrown area surrounding their business and found some cool relics (keys,locks, horse tack, old make-up compacts from the turn of the century) and of course COINS. Good luck, parks are fun because you find stuff every trip...but places like this are the prime spots we all look for.