Suppose you find yourself; for whatever reason, floating down a calm river on a small raft. As you wake up you slowly take in your surroundings and notice that you have a first aid kit, a warm space age blanket, a waterproof bag tied securely to the raft to keep the other stuff dry, and nothing else.
The banks of the river look wild and inhospitable. You have no easy way to propel the raft to the shore and, for now, the river is placid and peaceful.
What do you do?