Stranded II 
Ideas for items -- no good at script/model
1 
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Scuba-diving gear -- lets you stay underwater for a very long time.
Trap pit -- If an animal gets close to it, it'll disappear. It works sort of like a storage, getting the meat and stuff out.
Stone oven -- looks sorta like this http://www.fornobravo.com/graphics/residential_ovens/Photos/stone_oven_001.jpg . Lets you bake faster/more at a time. The fire doesn't go out in the rain because it's covered.
Fish farm -- Looks sorta like a box with water in it, built on the shore. You can get fish out of it, like a storage.
So, if anybody likes it, use them.