I'm not planning your itinerary, but telling you mine. Be creative.
Last year: (Pittsburgh to San Diego -- moving):
Idlewild, Sea World (Aurora), Holiday World, Six Flags St. Louis, Six Flags Elitch's, Riverside, Manhattan Express & MGM Grand park (Las Vega), Buffalo Bill's.
This year: (Also Pittsburgh to San Diego, driving a truck with furniture): Kennywood, Waldameer, Paramount Kings Island, Six Flags Kentucky Kingdom, Worlds of Fun, Santas Workshop (Colorado Springs), Castles & Coasters (Phoenix)
Obviously, there were a lot of other choices, but we tried to pick ones we hadn't been to in the last year, AND we had to keep to a fairly straight route, AND because we are traveling in August, some of our first choices were already closed.