I've lived close to Walnut Creek, located in the San Francisco East Bay, for most of my life. The city has a Mediterranean climate--moist, cool winters and dry, hot summers. Granted, it is more of a place where people live than a destination to visit, but Walnut Creek has much to offer.
Despite its agricultural roots, Walnut Creek is very much a suburban utopia. It lacks the excitement of the big city. However, San Francisco is only a BART (Bay Area Rapid Transit) ride away, and Walnut Creek has a station with a direct line.
Walnut Creek has a number of educational opportunities such as the Lindsay Wildlife Museum and the Lesher Center for the Arts. For fans of the outdoors, Walnut Creek boasts a bounty of gardens and parks. The Boundary Oak Golf Course is an 18-hole green with manicured lawns and lovely views of the surrounding hills.
The shopping in Walnut Creek is also fantastic. My girlfriends and I will often travel miles to spend a leisurely afternoon strolling about the Broadway Plaza Shopping Center, or eating at one of Walnut Creek's great restaurants. The Counter, specializing in gourmet burgers, is a personal favorite.