Your sense of adventure and don’t forget your sense of humor.  Also be sure to take along a torch/flashlight (headlamp is good for reading that good book that you bring along).  Sarong, swimming suit, shorts, binoculars for the wild life, camera/video, hat, long sleeve shirt, sun glasses, sunblock, natural bug repellant just in case, and try to bring only natural soaps, shampoos, etc.  Think nature…  think fun…