Can you do 4 nights at AoA & 5 at CR? That would be my choice. Staying off site you'd have to factor in parking fee, rental car & gas. So it may be just as cheap to do your 4 nights at AoA then off site. I wouldn't stay off site without a car rental. Even if hotel says they have a shuttle, they're not that great. Going in the morning is ok, its the evening shuttles that are a problem.