It's my first time traveling to Oahu. I've heard the island is small. So is their really a need for a car? I'm going for 4 days and I would like to visit Pearl Harbor as well as the polynesian cultural center but I dont know how hard it would be to commute; any suggestions please??? from previous travelers? 
Also any tips, pointers? do's and dont's?
Also any tips, pointers? do's and dont's?