Some folks on Lemmy recently recommended StreetComplete, and I’ve been really enjoying it so far.
It’s a “Pokémon Go” style thing, but you go around answering simple questions about your surroundings which are then used to update/improve the data on OpenStreetMap.
One concern I considered after using the app was that because your contributions are uploaded to OpenStreetMap, in theory I imagine someone could use that data to track where you are / where you’ve been / where you tend to be. So just be aware of that.