The Seattle area has the Seattle to Portland tour, here in the Bay Area in California we have the Sierra to the Sea bike tour - "a scenic and challenging 8-day bicycle and camping tour through Northern California." This year tour will be help on June 19-26, 2010. "Starting in the Sierra Nevada Mountains, the tour traverses the Sacramento and Napa Valleys, passes down the Pacific Coast, crosses the Golden Gate Bridge and concludes at Golden Gate Park in San Francisco." A total of 420 miles, with an average of 60 miles per day.
Seems to me that this is less strenuous than a one day STP ride (~206 miles). Not sure yet about elevation gains in the Sierras - which could make this a more interesting tour. One can also add a Lake Tahoe Prologue which ads 3 extra days of riding around Lake Tahoe.
Registration starts on January 19th, 2010 at 6:00pm and can fill quickly - based on past tours this can be 1h to 1 day. If you are interested, you need to be ready to sign up on the 19th at 6pm.