San Francisco is home to some of the most earth-loving urbanites around — so committed to greening their town that they've banned plastic bags in grocery stores. Rent a bike to pedal around, or beat the hilly terrain in an electric-powered streetcar. Munch on organic produce and learn about how food is grown at the Ferry Plaza Farmers' Market. Then tour the sculpture garden at the dump — trash turned into treasures! Relax in eco-style at the Orchard Garden Hotel, the first LEED-certified (environmentally sustainable) hotel in America.

Recommended for: Families of all shapes and sizes who enjoy cities
Not so hot for: Beachseekers — it can be chilly