You seen the movie "Cast Away" with Tom Hanks? Signal fires no matter how tall you make them, not necessary seen by anyone. Well, so far they been stranded for 7 days. Most people who get stranded doesn't give up and fall into apathy within the first week. Must be search parties and such out looking right? Hope will vanish over time. No one would take a risk sacrifice their life within a week if there is hope of search parties looking and rescue.
You might try to "Bear Gryll's" it, but you wouldn't have any camera team tracking you
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I prefer character development over "action packed" stuff at this stage. So far their survival skills just about managed to start a fire and catch fish. I don't see them build a boat or a raft anytime soon. It's not exactly six days, seven nights. If you seen the movie.