Plenty of crab all around that island. We usually crab right outside fisherman's bay simply because we moor our boat in the bay - I'm sure there are crab in the bays on the Spencer Spit side as well. Don't know anything about clamming there - never seen anyone do it. As for fishing, most guys travel around the south end of San Juan Island to fish the west side off of cattle point, salmon bank, eagle point, lime kiln, etc. Others fish along the west shore of Lopez just south of Fisherman's Bay.