I agree with most of the other posters as well!
Depending on how mischieveous you are, I would recommend breakfast at the Wilderness Lodge (I, unfortunately, do not remember the name of the restaurant though). Without giving away all the fun, its a great meal. Make sure to ask for some Ketchup though, its mysteriously missing from the table!
We were there last February, and after our meal (but before the cheque), I got up to go to the washroom...when I came back, there were napkins and glasses on my chair, so I sat on my girlfriend's (now fiancee!) lap. The waiter came over and made it look like my gf put the stuff on my chair on purpose (though it was him who did it). I played along and then she had to ride a wooden horse around the restaurant shouting "I will be nice to my boyfriend, I will be nice to my boyfriend".
Soo much fun!