My suggestion is to add mini games (cards/dices) to taverns, maybe if we could gamble some light money on (like 5-10-15 coins bet, just for fun).
EDIT : Get some rating out of it in order to avoid the gambling tag on the game? Ladder system, nothing too complicated... but some cosmetics associated with it in order to make people play.
It could gives us something to do at the outposts. Even settle disputes over a game of cards.
Voilà!
