Is the 5 year old a girl...and maybe into tea parties? The Afternoon Tea at the Garden View inside GF is wonderfully special, delicious food and yes, it is very filling so even hubbys can get their fill. Not sure a 5yo boy would be as interested though.
I agree with the others O'hana is a lot of fun....time it so that you're there during the fireworks and ask for a table with a view of MK....that is a very different way to see them. Also, most nights O'hana has an entertainer so there is a little bit of fun as well.