How about sticking to one state? As I did over Christmas- Florida. I spent 4 nights at St Petes Beach then one week in Orlando then a final 3 nights at Miami South Beach. This was the ultimate combination for those (like me) wanting to do a little beach with a bit of Disney/Universal. As pretty much all of my family (including relatives from USA) flew into Tampa or Orlando. This meant I had to be considerate of what other people within the party would like to do. We stayed in a hotel initially, then moved into a villa during our stay in Orlando (something I would definitely recommend for those with a big family!) then finally finished in a hotel in Miami.