You need to enter the Pirate Cave in order to reach the treasure of Captain Hawkins and the second half of the Silver Tablet. The main problem are traps.
Right of the start, dig up Captain Hawkins' grave at 1 to get good loot. Then go to the westernmost ladder at 2, which leads to level two. On level two, ignore all the signs in the western labyrinth and find the ladder at 3, which leads to level three. There, take the hole marked 4, as it is the only safe one (you can recognise it by a gold nugget lying beside it).
On level four, go all the way to the east to the treasure chamber at 5 and blow up the door with a powder keg. Take the Silver Tablet half, the Storm Cloak and the Magic Fan. The rest is optional.