Step 1:
I glued four squares together into one large Origami paper.
Prefold in half, then fold both edges to this prefolded centerline.

Step 8:
Fold this edge to the right, make the same folds on the other side of the model.

Step 6:
Fold the edges straight downwards.

Step 11:
Turn the model again.

Step 10:
This is the model from below. Fold over these four purple lines.

Step 9:
This is how the model looks from aside.

Step 5:
Fold over the two outer lines, then over the two inner lines.

Step 7:
Fold over these three lines.

Step 3:
Press flat, see arrows.

Step 2:
This is the other side.
Fold over these two lines.

Step 4:
Fold over the upper layer and turn the model afterwards.

Ready!

Yes, yes, yes! The perfect setup for a long day at the beach :)