We have done both the dolphin cruies through Disney and through another company that is in Shelter Cove shops. Neither of the cruises we went on went into the open ocean, all stayed in the intracostal waterway which is more protected. The one through Disney was on a pontoon type boat that held about 6-8 max. Children under a certain age were required to wear life jackets. As stated previously, I don't remember the waters being rough at all. The other cruise we went on was on a larger ferry-type (holds 100+) people. I would say the ride on the larger boat was smoother just due to the size and the kids were not required to wear a life jacket; however, they were readily available. The larger boat was quite a bit cheaper than the one through Disney, but obviously not as personalized. When we went, the boat was not full at all and the captain provided lots of interesting tidbits about the island and some of the large, beautiful homes you will see. Of course the Disney one provided the same type of service. cgcw is correct in that the experience is not the same, you will get physically closer to the dolphins and have better interaction on the smaller boat. BUT, if you have never been on a smaller boat and/or are uncomfortable with smaller boats, I would recommend the larger one. My family and I enjoyed both cruises and would do both of them again in the future. We will be there in June and we are trying to decide which we want to do.