In The Sims 2 Castaway is there any other hidden treasure on the islandislands other than the one chest on Beard Beard's hidden pirate ship?

You need to go to west beach, find a really big rock. Inspect it and it should move. If it doesn't, you need more body skills. Go through the tunnel and you are now in the pirates cove. Go to the ship and up the steps. Go to the treasure chest and open it. The treasure is only a pirate outfit and sWord!