NG's top ten green destinations are:
Turks and Caicos
It was a little odd that they were classified as either "eco-success," "tipping point," or "watch list." It seems to me that anything on the watch list would be somewhere where tourism would not be encouraged. But I guess the point is encouraging more eco-minded tourism. See the link for more details. The article recommends things to do and places to stay while vacationing at each spot.