Emergency float (think a poncho raft, only simplier)
Fish gathering (fish like shady spots, make one for them)


And Jeff, you mentioned sitting on it- it will keep you dry, but unless you stuff it with insulating materials, it won't slow conduction enough to mater.
_________________________
-IronRaven

When a man dare not speak without malice for fear of giving insult, that is when truth starts to die. Truth is the truest freedom.