I will start by saying that this experience would have been much better if Viator had a better schedule laid out in the description. First cruise is 11-2, the second didn't board until almost 6:30. They don't tell you there is a 4+ hour chunk of time between the 2 cruises, so if you have paid to park in the Bight lot right next to the brewery then you will NOT want to move your vehicle from that spot or you will never get it back. So plan something fun in between or plan to be hot, sweaty, and waiting without a place to sit unless you want to drink and people watch at the brewery.
Also, check in time. It's really a half hour before boarding for both cruises.
The dolphin watch and snorkel tour was excellent. Not sure what the capacity of the boat is but I think we were well under it because there was plenty of seating for all. The crew was amazing, knowledgeable, and high energy. Advice for those that haven't spent a lot of time boating: pack light. You will want your towel, sunblock, and a bag that you can tie or clip around one of the seat or table poles to hold your small personal items. Otherwise know the wind will throw your stuff around and possibly overboard. They have literally everything else you could need, it's only 3 hours people!
The second cruise. I want to start by saying the captain and crew here are also fabulous! Was told check in was 5:30, boarding at 6. Check in at 5:30 and am told boarding is 6:15. This doesn't sound like a big deal, but know the line is forming on the dock and the sun comes around in the afternoon and is just blazing down upon you while you stand, and wait. At 6:15 the captain starts working his way down the crowd and asking where you want to dine, and your answer determines when and where you eat. We board at 6:30, but there is nowhere to sit until they call the first group to dine inside. They call the second group (outside eaters) once the first group is seated and eating in the dining room. So you stand in line over people seated trying to eat all around you. Then you try to go back upstairs to eat, but by now the first group is back outside so good luck finding a place at the one table or a seat in which to eat at. So if you got the table cool! You can set your plate down. Or if you got the bench you get to juggle your plate and utensils while the wind blows your food onto the people next to you. You also probably missed most of the sunset.
Bottom line I wish I had just done the snorkel tour and not the dinner cruise. Dinner would have been better if there weren't so many people, but they gotta make money somehow!