If you are fortunate enough to live close to a beach, I'm sure you and the kids in your life have learned the fun of playing in the sand. Many of us are not so lucky and visits to the beach are few and far between or not at all. I am always on the lookout from every source for fun ideas for the kids during summer vacation and here is a great one.
Make your own sculpting sand:
Clean play sand (available at most home improvement stores)
Mix together the sand and cornstarch at a ratio of 3:1 (12 cups of sand and 4 cups of cornstarch for example). After it's thoroughly mixed, add about 3 cups of water. Mix slowly adding water until it is a good consistency and packs nicely. Store in a plastic pail with a tight fitting lid. You can always add more water when it starts to dry up too much or starts to get dirty. Now, build, build, build!
Here are some good books to give you ideas:
Sea, Sand and Me by Patricia Hubbell
Super Sand Castle Saturday by Stuart J. Murphy
Sand Castle Bash: Counting from 1 to 10 - Jon Scieszka's Trucktown Series
Sisters Are For Making Sandcastles by Harriet Ziefert
Sand and Surf by Tanya Provines