Swimmers intimidated by the Pacific's wild waves can head instead to 415's equivalent of a tidal pool in the extremely accessible, calm waters of Aquatic Park. There's no need for membership in the nearby Dolphin Club (with its private beach, pah!): Note the many people cheerfully stripping down and jumping in for a few laps beneath the watchful eyes of tourists waiting for the Hyde Street cable car. Bathers range from marathon swimmers to doggy paddlers; then there are those who simply plop on the surrounding sand without bothering to get wet. After your dip, stroll on the pier — dodging the Segway tours — and observe the crabbers pulling Dungeness crabs and starfish from the Bay. No need to tell them where you elected to pee.