Be Aware Of Local Dangers & Heat Stroke
Besides the things above it is also good to be aware of the local dangers that exists in your area. Take measures to protect your dog from ticks, snakes, strong currents etc. Also keep your pet cool and know the signs of heat stroke.
If you travel with a car to the dog beach, remember to never leave your pet in the car, even for a moment! It only takes a few minutes for the car to turn into an oven and dogs left in hot cars can die within minutes from a heat stroke! Always keep an eye on your dog and make sure that they are safe.
Also it might be a good idea to avoid feeding your pet dinner right before and after visiting the dog beach. Personally I am always worried about bloat / GDV, so my dogs never exercise right before or after eating. I also always like to give my dogs a quick shower after going to the beach to flush off the possible dirt and the smell of the lake.