Which ports are best for snorkeling: St. Maarten, St. Lucia, Barbados, Martinique, St. Kitts, St. Thomas?

[Sistersinlaw]

We are doing Southern Caribbean over NY, which ports are the best for snorkeling - please let me know of any great providers as well!  Stops are: St. Maarten, St. Lucia, Barbados, Martinique, St. Kitts and St. Thomas.

[CntPAcruiser]

Of the ones I know, St. Maarten, Barbados, and St. Thomas would likely have better snorkeling. St. Lucia and St. Kitts are islands with incredible natural beauty, in part created by volcanoes, so a land-based tour is a great option. St. Kitts also has a world heritage site, Brimstone Fortress.