We have seen it twice, while I did enjoy the show, I don't think it is a must do there is so much more to do in and around Orlando. The venue is nice, but the seating is another issue, there is no leg room, and you are sitting on each others lap, not the best when some people are coming from the parks .... lets just say in need of some hot water and soap and please don't forget the deodorant. Then the walk after the show was a killer.
Not sure if you will have a car, or what time of year you are going. There are lots of putt putt golf places, at WDW and at over at US. Maybe a beach day, you could most likely rent a car, get a picnic and stay all day, for what it would cost for a few hours to see the show. Also if you are going during December, There is the ICE show at Gaylord Palms. Really great family time.