West Bay Beach in Roatan is awesome for snorkeling! We did an excursion where we did the zip line and then they took us to West Bay Beach for snorkeling afterwards and it was a great excursion.
Our daughter did the zip line cave tubing excursion in Belize and spoke very highly about it.
Both of us were very glad we did what we did and did not do it through the cruise line, which is not as good, cost more, and was more crowded.
Both of us purchased our excursions through Shore Trips, but there are other companies also offering packages.