We did Dolphinaris a few years back outside of disney. We had a group of 10. We walked from port, was escorted past the DCL que, given lockers, towels and then taken directly to the dolphin area. Afterwards we were able to snorkel in their little cove out back. After snorkeling and our dolphin experience we were fed lunch (and booze). We also had a free picture of each one of us during our interactions with the dolphins. All and all it was a wonderful experience. I want to say the cost was just a bit more than the DCL excursion, but really really worth it when it included lockers, towels, lunch and a free picture.
Good Luck!!!!!