Check out my post about the beautiful, brand new
Bonfante Gardens Theme Park in Gilroy. The post has lots of pictures, it may be slow loading. There are links to the park's website there as well.
If I were going between Santa Barbara and SF with friends who like interesting places

, and had plenty of time to tour, here are the other attractions I would check out, for interest:
Hearst Castle
Madonna Inn (classic kitsch, stay one night, definitely eat one meal there)
Pismo Beach and Avila Beach
Big Sur
Pt. Lobos
17 Mile Drive
Pebble Beach
Carmel
Monterey - the Aquarium is wonderful, stay in the wharf area
Capitola Beach area and marina in Santa Cruz, eat breakfast or lunch at Aldo's
Santa Cruz Downtown (very intersting shops, college town, quite hip

)
Santa Cruz Beach Boardwalk (historic coaster and carousel)
Rt. 9 and Skyline Drive, through the Santa Cruz Mountains (especially if you decide not to do the 5 hour drive to Yosemite or longer to the Sequoias... stop in Boulder Creek for lunch or dinner at Adelitas, check out the Brookdale Lodge, lots of interesting restaurants on that route)
Big Basin State Park with the 12-mile Skyline to the Sea Hiking Trail (incredible redwoods, waterfalls, leads right to the ocean)
Ano Nuevo State Reserve (if the elephant seals are there)
Bonfante Gardens Theme Park
Great America (cheesy park with great coasters, if you need your coaster fix

)
If you see a Hobee's restaurant, definitely choose that over other chains. Trust me!
