The 10% discount is better than the DC discount, so if you are going to the parks every day of your visit, you should do the math and see which is the better deal. You can find the ticket prices either here or on Deb Wills site. The other thing to consider is that the park hopper days are good forever, if you decided not to hit the parks one day, you could save it for later. We will overlap your stay - going from June 15-24 and I like that with the park hoppers, we can use the park days for parks and then we are spending two of our days just going to water parks then out to a nice dinner. Makes me feel like I am not wasting a "day" on my park hopper or ultimate pass. I also don't know if you can drop off your arrival or departure day if you take advantage of this deal, so you should check that too.