HH is also our home.
There are several options for the dolphin cruises. If you book the one from the resort it is more expensive, but also more private. It was two years ago that our family chose this option, and I want to say that it was around $30 per adult. With this option, you board a pontoon boat with just your party. It's nice to have your own "private" tour, and being on a pontoon you are closer to the dolphins. We were taken down Broad Creek, and found a shrimp boat. We spent the longest time watching the dolphin feeding from the cast overs. We got beautiful pictures!! It was amazing. Last summer we chose the other option. Just across the harbor at shelter cove there is a place called adventure cruses. For much less money (think it was closer to $15 per adult) you board a big boat that can hold nearly one hundred people. When we went there were probably 30 people with us. We enjoyed it also, and definately enjoyed spending half as much. It was just a very different feel .... it depends on which you prefer. Either one is definately worth it. I think that a dolphin cruise will be in order for all of our future HH trips.
Our daughters both absolutely enjoyed their unbirthday parties. Any time that you can tell a kid that they will celebrate their birthday ... and it's no where near their birthday ... how can you go wrong there? They thought that was pretty special. They play typical "birthday-party-like" games. Definately, if you have children ... there is plenty scheduled to entertain them.
Enjoy your trip ... I'm confident that you will ... it truely is A MAGICAL PLACE!!