If you want to find this beach, get the map out. It's beautiful and off the beaten path.
You'll need your GPS to find this beach. At a certain point, you'll leave the paved road and start driving on a single lane dirt road. The dirt road is an easy drive, just go slow. Any type of car will be able to make it out there and back.
When you're on the dirt road, look up a few times. You might get a chance to spot some "huge" spiders hanging over the road.
Bring your snorkeling gear. The water is really clear. It's basically a rocky beach until you get about 40 feet away from the shore. Once you're out past the rocky bottom, you'll find sand and sea grass patches here and there.
In the water, there's a very gradual slope to the bottom. You won't have to worry about the kids splashing around.
There's nothing out there. The "parking lot" is tiny. It might hold 4 cars at most. That's it.
Last Bit of Advice
Pack an umbrella. There's almost nothing for shade on this beach.