I was just thinking that it would be cool if there were some time passing activities to do in the Tower. For example, you could add a shooting range so you can test out your guns. Another thing you could add could be a poker table or a black jack table were other players can play against each other for Glimmer.
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They do have a side activity! It's called kickball, hahah. You just have to find the ball. You'd be surprised how entertaining a ball can be. There really is a ball in the Tower. However, all joking aside, I agree that the Tower could have some more "meat" on it. I think having a shooting range where you test out guns that are available from vendors would be a spectacular idea! When the most "social" part of the social hub is a lobby for the Crucible, which is also available from the Planet Select screen I might add, there's a problem.