We did the Sunset Sail on America's Cup, and as it states in the description you have to sit on the floor of the vessel on stadium cushions. I will tell you that doing so for two hours is not fun and certainly not comfortable at all. It really ruined the sailing for us, as it was simply not comfortable for two solid hours, and there really wasn't anywhere else to go on the vessel, as it's relatively small.
The staff was nice and professional, and it was nice being on the water as always, but 35 min into the sailing and we were counting down the minutes, which is a real shame. Again, the crew was great, and no complaints other than the lack of comfort.