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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to be fair, this kind of thing has been done to death in open world games, and was even in the recent watchdogs - if destiny was to include game activities in the tower, then it'd be really good if bungie did something new and original instead - I've still got reservations about it, however