What an adventure! You'll be seeing a large chunk of the West on this epic road trip.
Disneyland is in Aneheim, and is fun in the summer, but it'll be super busy and sweltering hot in August. What kinds of things are you interested in? You'll be close enough to the beach to enjoy some fun in the sun, maybe learn to surf if you're interested in that sort of thing. Some great mountain biking, hiking, etc.
I'll be stuck in Ohio, so no meetups here