When our girls were 5 and 7 we made plans to take them to Disney, but we didn't tell them where we were going.
Oh that was a wonderful surprise?  What was their reactions?
Well, at first they were like "But we wanted to go to the beach!" because that's where we told them we were going.  But that faded quickly as they realized where we were staying and what we were doing.  I loved seeing their faces!
Ah, well Im sure they had a wonderful time.  It is the happiest places on earth.