Absolutely loads of fun! Booked the sightseeing/snorkel cruise to the NaPali coast. They try to keep their group to a minimum and the boat is situated such that you are able to sit on benches and face forward. We stuck the kids in the forward bench and they had great fun being sprayed by seawater. We saw turtles, and dolphins and tons of fish. This is not solely a 'snorkeling' cruise, although they do stop to snorkel for 45 mins but sightseeing is the main venue, therefore this was a great ride for the very young and the very old. They provide full snorkel gear, and you can enjoy a great deli lunch (it's catered) while others are snorkeling so you can eat if you chose not to snorkel. I would recommend the morning tour as the sea gets rougher in the afternoon. If you are prone to seasickness, such as I, I took dramamine after an hour -into- the trip and was fine for the duration. My sister in law took hers at the beginning, and felt no ill sideaffects of the drug or sea. I would highly recommend this tour if you are traveling with a mixed group of kids and adults, especially for those who don't want to snorkel. There were 19 of us ranging from 6 through 75 years old and we all had a lot of fun! The kids said the boat ride was the best part of the trip! Some crew members grew up in Kauai and are very knowledgeable about the island.