Tipi Tent

If you have a large canvas tarp, or 3 or 4 small canvas tarps in your party, you can quickly assemble a tipi like the Native Americans of the Great Plains. If it's large enough, you can even have a small campfire inside.

Cut down a small number of slim trees, and trim off all branches, and then lean them up against each other, and then wrap the canvas around the structure, leaving a small hole at the top (so smoke from your campfire can escape). Be sure to wrap the canvas in a way that leaves you with a small door you can peal back to enter and exit, that points away from the wind. (If the tipi is big enough, four or five of you can all sleep inside by the fire.)
10' x 12' Heavyduty Tarp