Heritage Marina (now closed) Slip into this watery retreat on Van Ness

Depending on how hardcore you want to get, there's a couple ways into HM's watery retreat. You can a) head through guest parking garage No. 2 and over to an easily jump-able chain-locked side door in the SW corner, or b) hit the front desk, then slip through the side door on the right and wind your way to a small room w/ an elevator and a staircase -- the elevator's busted so trek it to Floor 1 and you're in there like swimwear, which is hopefully doubly true.