I have very fond memories of building elaborate sand castles on the beach during our summer vacations. We dug moats and built towers. The best part was the "drip" castles. To make your own drip castle, take some rather watery sand in your hands. Then just let it drip through your fingers to wherever your castle should be. It can become quite an art as you create tiny turrets and spires.
Of course, I also went to the beach with just my sisters. Very rarely were we joined by a boy, and when we were, he helped build the castles. My experience today is that little boys prefer destroying the castles rather than building them. Which is perfectly fine and entertaining. :)
