My DD did this in 2000 at the age of 5. It was the best money I felt I spent for her on that trip. (About $23 that year.) She loved it, and she talked about it for weeks afterwards. At the time, they had chicken nuggets, some kind of sandwiches, decorate your own cupcake, and apple juice in the tea pots. They started with dessert first which the children loved. The one long table was beautifully set. They took her picture with Alice and the Mad Hadder, who had also autographed her placemat. (We laminated it at home and she still uses it.)
It looked like so much fun, I wish I could've stayed. The children stay without their parents. (So take pictures of the table before you leave the room.)
It was an hour long, so I went and had a relaxing wait with an ice tea and a good book.