I'm thinking of buying a 2-day park hopper for our upcoming trip to CA. Since we are renting a house on the beach, I'm planning to do more haning out at the beach. But we can't NOT to Disney. I'm thinking a 2-day PH will give us our Disney fix without taking away too much time from the beach. DH thinks we need 3-day PH. My question is, if we buy the 2-day PH, can we upgrade it to a 3-day PH at the park if we decide to do so? Is the price the same difference as to what I'd get online now (about $30 difference)? Thanks for your help.