You're lucky you have so many! Jackson LOVES the beach. He goes crazy with water and beaches, lol. We only have one dog beach close to me (it's inside of our state park, with the big dog park we go to) and it's closed due to erosion.
I don't let Jackson off leash though because it's not fenced and I don't trust him enough so I put him on a long leash. The beach isn't even big tho.