I only have some guesses about the Seahorse snorkel as I haven't been on it. One, they are trying to give you more choices. Two, some people(one being my mother) loves to snorkel but doesn't like to snorkel from shore, can only snorkel from a boat. She says she has a hard time getting back to shore if you leave from shore but she can climb back into a boat and they can bring her back. Just telling you her reasoning. Three, alot of people complain about the snorkeling area getting cloudy as more people get in there and you can't see much, I would also assume with the boat going out further, that you would have better snorkeling area because it is not used as much and not so close to shore. But again, those are guesses, my mom is doing the Seahorse Snorkel on 11/28 so I will let you know their review when she gets back.