Carry a second tarp and some rope so you can rig up a roof for the camp kitchen or dining area.
- String the rope tightly between two trees, about as high as you can reach.
- Drape the tarp over the rope forming the a ridgeline.
- Use rope to secure the corners to other trees, keeping the “eves” lower than the ridge for drainage.
If there are no grommets along the edges of the tarp, tuck a small pebble into the material and fold it over. Then loop a simple overhand knot over the tucked pebble and cinch the line tight. That creates a grip point so you can "guy" the lines out to keep the tarp taut.
If you have no tent at all, a tarp (or even a piece of lightweight plastic sheeting) can be rigged up to provide good shelter.