I understand why they added Wilson to the script and I think it was necessary but I am not sure I would do that myself.

The cave makes sense initially but he never really improves upon it. I guess I am thinking of all the stuff they built on Gilligan's Island (which was fictional of course). It just seems like he should have built more stuff...perhaps build a hut, a bed frame, table etc. inside the cave.

Also, he was there four years. He could have started building a raft in the first month and had a much nicer raft than the one he used.

I still like the movie. I just think if it were me I don't think I'd have a Wilson and I would probably build more stuff somehow.