I live on Cape Cod (far northeastern coast) and we are surrounded by water. Dozens and dozens of beaches, including the Natl. Seashore, but none exclusively for dogs. We do have a few small lakes and ponds that are set aside for dogs.

Dogs are allowed on the beaches from Sept. through May. In the summer, you have to go very early in the morning and in the evening. People are good here about picking up after their dogs and themselves. We have dispensers with poop bags at the entrances to the beaches and lots of trash cans. The beaches are "raked" every morning by the town. I'd have to say the beaches are very clean and the water too, though not as warm as KayAnn's! I love seeing the dogs enjoying a romp and a swim