When I'm not in the mood for something competitive I love just jumping in and going around hunting various animals to complete the trapper outfits. This game has one of the most serene settings and vibes to it, with headphones on it's really immersive atmosphere.
This game is so unique. As
@Bocephus86 said, it's amazing how you can spend 3 hours and not really "accomplish" anything, but still have a great time. This game may even beat Skyrim in my book in terms of getting lost in the world and have more fun doing side things than actually "playing" the game.