Once you’re kids have built that beautiful drippy castle, they need to protect it from the ocean. Help dig a trench around the sand castle and build a dam with the sand from the moat.
The ocean tide always wins this battle, but the kids enjoy trying to dig and re-dig the moat and build and re-build the dam.
It turns into a beach activity that the kids love. It also turns into a beach sound you’ll love as the kids laugh and giggle trying to battle the ocean tide to save to their sand castle. Keep your camera and video-recorder close for this one!