I was just reading the book Congo and when I got home I thought that Survival RP should have a life raft. So here are the two options:
The life raft (subsurfed). Extra vertices because objects filled with air are generally smoother:RemovedEdit: We're using the second one.
The life raft without the subsurfing because you may not like the subsurfed one (I personally like this one better):

(I know the rope going around is inside the boat, but it's just so you get a general idea of the boat shape)