I just built this little site where you can find and review campgrounds in California. I have over 1300 individual campgrounds listed with accompanying data such as elevation, flush toilets, potable water, etc, all using K2's Extra Fields feature. I still have a lot of work to do integrating even more data and pictures of campgrounds, and allowing users to share photos, etc. But it is already pretty cool.
www.campspotr.com