San Francisco is quite small, yet its hilly terrain and patchwork demographic profile gives it more distinctly defined neighborhoods than a city five times its size. As a result, the sights, sounds and flavors of this community—and even its climate—can change within a single block.

Castro Street & Noe Valley

The center of San Francisco's gay community and a landmark for gay culture everywhere, the Castro is full of bars, dance clubs, restaurants, and one-of-a-kind shops, located in the commercial area around 18th and Castro Street. There's arguably more street life in the Castro than anywhere else in the city, especially on weekends. The gleaming neon sign of the Castro Theater greets visitors as they make their way down the street, with its Spanish colonial architecture and various blockbuster and independent film screenings. The Sisters of Perpetual Indulgence sometimes make an appearance at special events (they're really men in nun drag) such as the Castro Street Fair, and take it from us—this is the place to be on Halloween. Trek up Castro to Liberty Street to see exceptional Victorian homes. Over the hill lies Noe Valley and its main shopping strip, 24th Street. Cute and relatively quiet, Noe Valley has enough great restaurants and gourmet food shops to make it sophisticated, but not enough many chromed-up bars and Italian clothing boutiques to make it stuffy.

Chinatown

The greatest single concentration of Chinese people outside of Asia—a population of roughly 80,000—live in the approximately 24 square blocks of Chinatown, making it the most densely populated area of San Francisco. As you walk around, you'll be richly rewarded by the sights, sounds, smells and tastes of this vibrant community. Grant Avenue is the decorative showpiece of Chinatown, each year hosting the Autumn Moon Festival Street Fair and the ever popular Chinese New Year Festival & Parade. The neighborhood is also known for its excellent Chinese dishes from freshly-prepared poultry and seafood, to the staple, Dim Sum.

Civic Center & Hayes Valley

Stately Beaux Arts buildings like the War Memorial Opera House and the domed, renovated City Hall are situated near the modern Louise M. Davies Symphony Hall and the Public Library's graceful Main Branch. The Asian Art Museum is also in the area, housed in the former Main Library building. Nearby Hayes Valley offers fine dining and apres-symphony toddies for concert-goers, as well as tastefully creative stores for clothing and gifts.

Cow Hollow & Union Street

The grand, imposing homes of Cow Hollow (so named for its original bovine residents) are nestled against the Presidio where Pacific Heights dives to the Marina. Spectacular views are the norm. Straight, single yuppies pack the Balboa Cafe, Sushi Chardonnay, and other bars and restaurants on Fillmore and Union Streets. Clothes hounds can easily fritter the day away in Union Street's many upscale and tasteful boutiques.

Downtown & Union Square

Union Square is the heart of San Francisco's bustling and stylish downtown shopping district. Posh department stores such as Neiman Marcus and Macy's ring the one-block square park. Hundreds of other exclusive stores, boutiques and shopping centers, such as the Westfield San Francisco Shopping Centre, lie within a three-block radius of the square. If you've shopped till you've dropped, pick yourself up at an outdoor cafe in tiny Maiden Lane, and restore the soul at one of the many art galleries on Sutter and Geary Streets. This is also the home of San Francisco's modest Theater District.