Beaches in Oklahoma are mostly around man-made lakes. We are "Frontier Lake State" only because of these man made reservoirs. We are extremely grateful for the most part, especially during summer. Summers here can last May through September with many days over 100 degrees and the wind blowing over 20 miles an hour.
If you are looking for some fun activity ideas, check out my Summer Activities Pinterest board.
Usborne has some neat looking books about the Beach. I think "On the Beach" is the one I'd pick first, but the musical Storytime App for "Hush Little Beachcomber" sounds really nifty too!