More ideas from Henrik
Here's an interesting idea we came across on pinterest, fill a small frame with flat river stones & keep a hose nearby to rinse away sand. This would be great near a pool, What do you think?

For the beach house* river rocks in a box + garden hose = clean feet what a great garden idea! Placed in the sun will heat the stones as well. Great way to wash off little feet covered with grass and dirt before coming inside.