I just returned from an RCI cruise which included Antigua. I took a full day Eco tour with Eli's Eco Tours. The web site is adventure antigua dot com. They picked us up at the dock on the 52 foot powered cat and off we went. We were the only ones from the cruise, there were some other folks from hotels. Tony, Corey and One Love were the crew and they are some of the nicest people I've met. They showed us a wonderful time and we had time to snorkel too. They provided a nice lunch and plenty of rum punch at the end of the day. My time with them was one of the highlights of the trip and I'd do it again in a heartbeat.