My family of four can't say enough good things about our snorkel trip to Lana'i with Pacific Whale Foundation aboard the Quest. Everyone from the captain to the crew was exceptional in pointing out dolphins, and various turtles and fish. It was past whale season in late May so we weren't expecting to see any and were not disappointed that we didn't.
Saw tons of Spinner dolphins and enough fish during our 90 minute snorkel to fill 100's of aquariums. The crew gives informational training on the way out to help you know what you will be seeing while snorkeling, and really interesting facts about the surrounding islands on the way back.
If Sergio is on your tour take some time to talk with him about his educational background and why he does this type of job. He is a very fascinating and engaging young man.
Take this trip, you won't be sorry.