3 pages found in
Tobago Cays:
A guide for cruising and sailing by Chris Doyle.
http://www.doyleguides.com/TobagoCays.html
Offers places for diving and reefs. The closest developed area is Union Island, which can be used as a base for activities.
http://www.tobagocays.com/
Information about the islands, places to dive, and traveling tips.
http://www.world66.com/centralamericathecaribbean/thecaribbean/saintvincentandthegrenadines/tobagocays