To be fair, St.John is still very gorgeous

A 7 day East Caribbean itinerary usually include St.Thomas, St.Martin (St.Maarten) and a private island of the cruiseline (each one has its own - usually located at Bahamas).

St.Thomas and its neighboring St.John and St.Crois are U.S. Virgin Islands. 80% of St.John is National Park. Incredibly beautiful beaches - the most famous is Trunk Bay.

http://www.nps.gov/archive/viis/VIIS/page3.html

St.Martin/St.Maarten is an island half belongs to Dutch, half belongs to France - with very different characteristics from each other.

Private Islands are just your typical Caribbean tropical paradise - Turquoise color sea, white sand beaches, warm water.... a great place to spend a day with watersports fun and a BBQ pinic.

The water in Caribbean is difficult to describe - Hawaii is good but cannot compare to Caribbean for that kind of sea colour. Of course there are many other places in the world have such beautiful water but those are harder to travel to...