Snow Runner. It's offroading game with heavy duty trucks. You finish tasks in different maps and different regions to repair them after some disaster or neglect. It's slow paced, some tasks can take up to full day to complete.
I find that this game allows for a lot of banter with friends while not being boring. If you cooperate you can do some more tedious tasks together or you can just each do whichever task you want.
And when I play single player, I love putting podcasts or audio books in background.