Personally, I like to micromap. I’ve mapped individual trees, poles, benches, and trashcans, for example. I also like to map forested/scrub areas. Buildings themselves are also kind of fun to map, so long as I have the building plugin installed to JOSM.
I know it’s not the main target of OSM, but I like mapping opening times of amenities like restaurants or shops. Often enough I search a Café on OsmAnd to find missing opening times, then I go have a croissant there and map it after. It feels like making a gift to the next person going there by using OSM
I think this is actually one of the most important things to map to help with adoption of using OSM data as a daily driver! There are so many missing POIs.
Yes and EveryDoor is the app to use for this in my opinion!