In my head, the deserted island I would be stranded on is the exact island from the movie, The Blue Lagoon, and The Boyfriend is stranded with me, instead of that drunk fat guy that drinks himself into oblivion. Which means that we will have plenty of fresh water and fruit to survive on.
Also, obviously we will have the skills to build the same, magnificent double story shelter they did in the movie. Was I the only one that thought that their setup in the movie wasn't that bad? Not even bad at all. Being stranded on a beautiful island with your man, with no animals trying to eat you and no other real danger, well, that sounds pretty amazing to me.
Now, the one thing that I would bring with me is a shipping container filled with shampoo, conditioner, face products, razors, scissors, body lotion, deodorant, sunblock, scissors and nail clippers. (I'm pretty sure Brooke Shields' character in The Blue Lagoon had her private stash there behind a tree somewhere, her hair was just way too shiny and clean throughout the movie.)
With my shipment of girly necessities, life on this deserted island would be perfect! I'm sure we'll be able to fashion some kind of coconut phone to call our families.