If you are coming for the mantas, we’ll don’t take it for granted as we didn’t even go to the water because it was too choppy. I assume they have ways of knowing when the condition is going to be ok or not and let people know in advance so that we could cancel. I was super frustrated with this trip. After seeing a couple of okayish corals, most of them already dead, with small fishes we went on a loooong trip by car to see two insta spots. Already back to the boat, we went to try and see turtles, which to be honest, apart from the restaurant that was also worth it, was really fun.
In sum, If you’ve never snorkled before it could be fun, otherwise there might be closer and cheaper places for you to go.