At the beginning of the game do the raptors nest quest. When you get there, save the game then start making your way through. If you are about to die, quickly save the game. If you die, just reload the game. You will start at the entrance with the experience you saved at and all the weapons. You can continue going through. All the enemies will be alive so you can keep gaining experience. If you are running out of space in your inventory, go to Seahaven and sell your unwanted goods. Then, go back to kill the rest of the creatures. Once you finish the area, do not go back to talk to the person in Seahaven -- just save the game and reload to start killing again and gaining more experience.