I trip to Disney is fun whether it is a suprise or not. If you don't mention it again, he will be wondering the whole time if it really was last years papers or not. So when you finally go or decide to tell him, he will be happy and suprised still.
My first trip to Disney is in December right before Christmas and I am so excited. I will have to use one of these tips to count down my very first trip! I feel like a kid waiting for Christmas!