when you first arrive you need to pick up 1 drift wood and walk over to the two standing up rocks and press make crafting bench. then after completing some goals you unlock bamboo crafting bench.
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go to the crafting area and then make it with sticks and a coconut
By building items ,crafting and harvesting food or animalshttp://wiki.answers.com/How_do_you_get_body_in_sims_2_castaway#ixzz1QCxokvgw
Use a mod!
On Sims Castaway to Make another Work U can Use Hard Wood
If you mean sims 2 castaway then you need vines for the rope and drift wood (which you can find in the crate by the beach). When you have this stuff go to the crafting station and make the rope. Then go to the bridge and you're done!!!!