The highlight of my Dominican Republic trip was a humpback whale watching in Samana Peninsula. The World Wildlife fund considers Samana one of the the best places to watch whales.
Gran Bahia Principe Cayo Levantado in Samana, Dominican Republic is a good choice for a Caribbean holiday. If you are visiting between mid January and April I thoroughly recommend taking a whale watching trip.
Cosidered by many to be the ugliest creature on the planet, the Humpback Anglerfish is perhaps the most effecient predator of the sea, having developed the most extreme reproduction behavior known to science.