Ive been to MP several times. There is a lot of seagrass in the water that washes ashore. They do their best to clean it up daily with a truck. Not many people get in the water-but some do, myself included. Sometimes there is more grass than other times. That said-you can always take the resort bus to downtown Cancun for the day and stay at the Beach Palace (which is worth a trip no matter what). The water there is a beautiful blue with lots of waves. Despite not getting in the water-I still chose MP for my October 2013 wedding as there is so much more to do there, including golf. There are also soooo many bars and restaurants and the service is outstanding! I also liked that it is not in the hotel zone, but a little more private-while still being so close to the action.