We will be going to Half Moon Cay on a Carnival Cruise in April. My 3 grandsons (13, 12, 11) want to do the Stingray Adventure. Does anyone know if they are able to do this without an adult being in the water with them? Since I have done this before elsewhere, I would just like to watch from the shore (which doesn’t look too far away and I also am hoping not to have to pay to just watch!)