You are so lucky that you are so close to the beach! I went once on a beach ride on Hatteras Island in North Carolina. I was there for my mom's wedding and I got to ride a QH mare who was so fast! She made it memorable. I would love to go again.
We ride along Long Island Sound sometimes. There aren't too many big stretches where you can just haul off and run, but it is fun. Once I'm sure he'll be able to deal with the sound of waves, we're going to try real ocean, hopefully next summer.
It would be nice if you could get some pics of the beach, I would love to see the colour of your sand. Here we have black sand. I used to do a lot of beach riding, my parents farm has a private beach, over a km of sand and a river to swim in. I should get down there more.