So yea ive found this out the other day and pretty much got it all down.
to find this location, when you start off on the free explore, just go left and keep going through all teh tunnels and such and youll eventually make it to Skywatch. enjoy the grind my friends.
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#Destiny
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Another one is getting the 'House Banner' .. additional 200G. I can't exactly remember what boss / mission that is though.