The water temp will be plenty warm. We did a snorkeling excursion through the cruiseline to Goffs Cay. They picked us up from the ship, so that was nice, no need to take the long tender ride into town. Had a very nice time snorkeling, saw lots of fish, and some beautiful coral. They gave us a guided tour while snorkeling and then returned us back to the ship.
We also did the snorkeling at Goff's Caye and had a great time. We were there in April 2004 and April 2005 and think that is the perfect time to go.
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Celebrity Century 1/09
Carnival Destiny 10/07
Carnival Destiny 9/06
Monarch of the Seas 3/06
Carnival Inspiration 8/05
Carnival Miracle 4/05
Carnival Inspiration 4/04
Sovereign of the Seas 4/03
Belize is hot in April, the water is like a bath beautiful and warm. I did a private snorkling tour here in Shark/Ray allley. If your interested in an american owned company that has several tours to choose from instant message me and I will send you the link.