I'm guessing this is a complete surprise trip?? He doesn't know about it?? Last year we surprised my DS15 and DS12 with a week at WDW. We gave them a big box with smaller boxes stacked inside. First box was a "gramp's Taxi", their grandfather was bringing us the the airport. Second box was an airplane, third box was Minnie and Mickey Mouse with a sign "come see us!!" The last box was a calendar with the date circled, We leave TOMORROW!!" The boys were actually speechless for a few seconds then they started yelling!! It was great.
If you are flying, it will be difficult to keep your destination a secret, MCO/Orlando but even if he doesn't know where you are staying, etc. Good Luck!!