sidewalk hunting

a couple weeks ago two friends of mine organized a brilliant scavenger hunt -- in honor of another friend's birthday. It was a four hour traipse through the Mission District and attuned us to the streets and buildings that many of us walk by every day and never notice. I'm so attuned now that I now walk around neighborhoods and imagine how signs, street names, buildings, whatever could be turned into an insidiously clever clue.

another friend of ours mentioned the same phenomenom. ah games, puzzles, I love 'em.

What's at the end of bay and near the bay, but across another smaller body of water?