1. Beach Math
Gather flat pebbles more or less equal in size. Use a permanent marker and draw dots an numbers. The result is a funny domino.
2. Beach Mandala
Take the flip flops of the whole family, some pebbles from the beach and your mandala is ready.
3. Pebble Fish
Have you ever looked at the shapes of the pebbles? Do it. You will be find that most of them are oblong. Gather a few long pebbles different in length (find two that are more round), and you can make such fish easily.