Thinking of staying at Casita Blanca in PM for our family - 2 adults and 2 kids. Beach swimming is a huge consideration for us...I've heard the beach swimming isn't that great becuase of the sea grass? Is the bottom sandy? The beach looks great - nice and wide and the town of PM sounds really neat. Am I overreacting about the beach swimming? We have 3 weeks and for the kids sake, I would hate to choose the wrong location. Comments??!! Thanks.