Wallclimb up the wall to your immediate left, and get into the pit with all the gold and stuff. Take gold as you wish, but make sure you activate the doorswitch. Get down, mindful of the floorguard (which should not bother you as you are in very open space with plenty of jumping room). Take anymore gold as you wish, and head for the opened exit. This level is very easy and very difficult to screw up.