OpenStreetMap is easy but has as much satisfaction as Factorio for me because it actually is helpful and has directly tangible results. Makes it feel somewhat game-like after you've done a couple edits and are just doing the routine things (not having to look up details about how to map a feature you're not familiar with). It's just the right amount of challenging to be enjoyable for me.

Forest walks, books, coding games or simulations, playing games like Creeper World 3 or Parkitect or Geographic Adventures, those are more common things I guess