Speaking of the scuttling crabs. I don't understand why they don't go after them for food. And I don't mean trying to go and grab them. I mean by setting up a trap. I saw this on one of the survival shows. You dig a hole in the sand, put a container of some sort in the hole. Put up 2 pieces of wood/branch on the sides and one across it, kind of like a BBQ spit, but have it up out of reach. Then you put some "bait" on there. The crabs scuttle along focusing on the bait, fall in the container and can't get out...LUNCH!!!!
And I know they have fishing gear, why hasn't anyone tried to use it? And those without the gear, try to fashion a spear/sling and use that. I know I would research the hell out of ways to survive on a deserted island before going on Survivor.
Or just do what this guy does: