Try drinking Ginsing beforehand. Its in such things as certain Sobe's (the best way) or other drinks from health stores (not the best way) and is heralded as a natural misquito repellant. I don't know whether or not its 100% proven, but after several hundred nights of hiking and camping, not to mention airsoft, I have never once been bitten excessively after taking Ginsing. It works for me.