There's also Jazz Camp West that you should consider, also here in the Bay Area.
It would help if you know what your goals are.
From what I've been told about Stanford, it's pretty good. Most of the people I know prefer JCW, but I'm sure there's plenty that go the other way. It sounds like a cultural thing. IIRC, Larry Grenadier will be there.
OTOH, I had a really awesome experience with JCW. I would say with JCW it's more about the collegial atmosphere, people really root for each other, and is more tailored for people who want a woodsy experience and really want to try out another instrument. Beginners are very welcome. One thing that isn't publicized much is that the Brazilian topics that shows up every year is especially strong - usually headed by Jovino Santos Neto and a few others. There's definitely a lot of not-well-know players who are astounding.
The bass faculty isn't extensive and at least last year, there weren't alot of advanced bassists. I'm going to try again going this summer more in the aspect of expanding my breadth of musicianship - prob by taking vocal or piano courses, not focused just on bass.
Centrum seems really appealing, esp with John Clayton being there. He's an amazing teacher and the faculty looks great.
My guess is that if you're going just for bass tutelage, it seems that Aebersold is gonna be pretty tough to beat.
====== Huy Nguyen =====
Playing the bass is either easy or impossible. -Michael Klinghoffer