Be more absorbent, have higher boiling point,must have tine finest fool proof brakes, have a cool compass that can guide you even in the strongest tempest, keep your sails,mast,anchor and all the sailors always in fittest state, invest vigorously in light houses,on the coastline,try to fix some trails,messages,marks for the next visitor or any one who may land there, sunshine is the optimum source of heat, light and energy, use reflectors. Water is must ,learn to conserve that-self defense is the ultimate virtue and others welfare is man-like expected value.