Two families I know rave about Rankin Ranch in the foothills east of Bakersfield. Depending on where you live in Calif. this might be a good alternative.

The most recent visitors went in August and were a upper-middle class family of five. Mom, Dad, and three boys (ages 15, 12, 7). Believe me, these are not "campground" kind of people, and they have already planned their return trip for next summer. The 15 year old went with a typical teenager's sneer that it was going to be lame. He told his parents afterwards that even if he had a job next summer, he'd find a way to get a week off to return!

http://www.rankinranch.com/

I believe they reopen in April.