Will be arriving in Orlando Monday March 9th (staying at the Nick Resort) for first trip dedicated to visiting the parks, leaving Saturday the 14th. We're trying to hit US/IOA, Sea World and Busch Gardens during this time. The big question is, can we hit both US and IOA in one day with no Express Pass? We have three kids, ages 2, 4 and 9. Also, since we're doing the parks Tuesday-Friday, is there any one day of the week we would be better off going to a specific park? Our plan is to spend one day at each park, and then have the other day of our trip open to revisit (2nd day free at US/IOA and Sea World) if we want or have a free day to spend at the pool at the hotel. Any feedback on this is appreciated!