Pier 39
The city's most popular waterfront attraction draws millions of visitors each year, who come to browse through its shops and concessions hawking every conceivable form of souvenir. The pier can be quite crowded, and the numerous street performers may leave you feeling more harassed than entertained. Arriving early in the morning ensures you a front-row view of the sea lions that bask here, but be aware that most stores don't open until 9:30 or 10 (later in winter).
Follow the sound of barking to the northwest side of the pier to view the sea lions flopping about the floating docks. Pier 39's biggest celebrities reside here pretty much year-round (though the population is generally lowest in early summer), enjoying the nearby food in the bay and the ability to easily rotate between sleeping on the docks and going for a swim.
At the Aquarium of the Bay ( www.aquariumofthebay.org), guests of all ages enjoy strolling through a space surrounded on three sides by water that is filled with local San Francisco Bay marine life, from the orange garibaldi (the state marine fish) to sharks. Aquatic animals from elsewhere in the Northern California watershed also make an appearance, including white sturgeon and river otters.