makaylee -
We had the same problem with our 4-yr olds who woke up every day asking if we were going on the "Mickey Boat" today. Cute at first but it got old fast. Our solution was to make a "vacation chain." You make an old-fashioned chain out of constructions paper links with one link for every day until your cruise. Every morning, we rip one link off and throw it away and the boys know that as the chain gets smaller, we get closer to vacation. We started at the 60-day mark and are now down to 39 days! They know that when it is all gone then we are going!
I even look forward to ripping a link off every morning!!

Enjoy