We and our friends and went to the beach for two nights. There were lots of sand dunes and they were SUPER close to the house. My friend and I thought it would be cool to build a fort that would be a cave. We put a pallet on the top of the fort to make an enclosed ceiling. Then we put sand on the top of the pallet to make it dark inside. And on all sides it had sand as walls. To get in we dug a walk way. That was the coolest fort I have ever built.