Four of us. I also contacted Marvin but I dunno if my friend would prefer a catamaran over a regular boat. Here was his response to me (I also asked about tour times as thats a lil confusing sometimes with ship times).     As per Cruise Mapper website, Carnival Horizon will be here at 7:00AM-3:00PM local time (8:00AM-4:00PM ship's time) on May 25th. Our earliest tour is the 8:30 AM local time 2-stop stingray snorkel trip. If you are able to get on the first tender boats off your s