The Coconut Coast is lined with coral barrier reefs and a series of “natural pools” - expanses of shallow sea with a floor of sun-warmed, silky-soft sand. The water is bright turquoise and unbelievably clear, making it easy to get up close and personal with starfish and schools of colorful tropical fish.
The main reason why there is sargassum in Punta Cana is that this area faces the Atlantic Ocean, which is the place where this type of algae proliferates.
The Dominican Republic's sea is so clear and blue because it has little presence of plankton – or other substances – and it's relatively shallow so most of the light is reflected. As a result, we see beautiful clear blue water.
Probably Bávaro is the most famous area in Punta Cana. It is located in La Altagracia province, which is the easternmost province of the Dominican Republic. Also, it is just about 15 minutes from the airport. Bavaro is best known for its luxurious resorts, villas, and the most stunning white-sand beaches.
There are no seasons in regards to anything in the ocean. Like Mike said certain beaches are polluted with jellyfish and others they are rarely seen, this also applies to many of the many other aquatic creatures. There is nothing you can do to prevent a sting from a jellyfish besides learning to love the pool.
The best months of the year for travelling to Punta Cana are by far between December and April. During this period, the probability of rainfall is lower, and the temperatures are warm enough to enjoy a perfect holiday on the shores of the Caribbean Sea.
Be cautious when dealing with strangers or recent acquaintances, be wary of rides or other invitations, avoid walking alone at night and don't leave drinks unattended. If you're a victim of a sexual assault or other crime, you should report it immediately to the British Embassy.
Beautiful BeachesLounging on warm sand surrounded by glimmering turquoise waters is definitely one of the main reasons to visit Punta Cana, and you will not be disappointed in this Caribbean paradise. Bavaro Beach and Macao Beach are some of the best beaches here, but any will be perfect.