I'm trying to plan our excursions and I have some questions that I'm hoping someone can help with: -Why does everyone recommend going with Captain Marvin's for the Stingray City Snorkel Tour rather than Disney? Is it just the price? -How big is the catamaran on the Disney tour? -How big is the boat on Captain Marvin's tour? -Are there bathrooms on both boats (DD is very concerned about this for some reason)? Thanks!