Seth is right, Disneyland is very expensive, at $76 for adults and $68 for children. It's a once-in-a-lifetime chance to see for most people though, and I can tell you you'll regret skipping it.

There are a few other good theme parks in California as well though, depending on what you're looking for. Are you travelling with children? Which would you prefer: thrill rides or movie themes? Here's a blog article with a quick round-up of some great theme parks in the LA area.