Polihale is our favorite drive in campsite on Kauai. It's far enough away that it's rarely crowded. On the weekends it's definitely a local spot for camping and surfing. You can drive your 4wd out on the sand. Or a normal vehicle can make it down the end of the long dirt road and you can walk a little ways onto the beach and set up your tent on the sand. There are bathrooms and outdoor beach showers. I don't think it's potable water though so bring your own! :) the large long beach is unbeatable and the towering mountains at the start of the Na Pali coast is spectacular!