Ke'e Beach is my all time favorite beach on the island of Kauai. You have the Napili coast to your left and all the chickens and roosters you could want! This is a very calm beach due to the waves breaking on the reef, so it is a perfect location for small children.
The snorkeling here is always good along the reef, the water is not too deep, 10 feet or so. Now to see the turtles you will need to be adventerous and swim over the rocks or walk. At the right time during high tide you can swim over the rocks, you will not have much room between your body and the rocks, so having gloves on so as not to touch anything and to have a piece of mind.
Once you get over the rocks the scenerary is gorgeous! It takes your breath away! Turtles come up out of nowhere and swim next to you! My only warning is that you are now in their house so don't chase them, try and touch them or feed them! Watch in awe from a distance. We had turtles from every size and they are so graceful gliding through the water.