We had a great time on Little Toot II even though we did not see any dolphins! Because of this, we were offered a free cruise at another date. I thought this was very nice of them. The crew was very friendly and professional.
Side note: a few days before, we saw the boat on it's sunset cruise by Clearwater Pier 60. Dolphins were jumping out of the water on the side of the boat following it into the sunset. We took the 11:00 a.m. cruise, maybe they were still sleeping :)