A shooting range to test your new weapons?
A race track to race sparrows?
Any ideas?
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How about an archive/library to look up backstory for the Destiny's history and lore. They could even add easter eggs and Feats pulled off by other players. They could even put in a "mini game" where you can break in to top secret files that will tell you about whatever shady events had lead up to the downfall of man or security footage of the last days of the golden age.