Polihua Beach is the most amazing and beautiful wilderness beach I have seen in the entire state of Hawaii, and it is the longest one specifically on the Island of Lana'i (stretching for 1-1/2 miles). I've seen images and videos of the beach in the past, but it is such a different and amazing experience when you get to see it in-person.
The only way to get here is via a very rough, bumpy and long trail from Lana'i City - Central on a 4x4 vehicle like a Jeep, and it really does help to have prior 4x4 driving experience. Allow about 1 hour in each direction, and you will come across a lot of rocky and somewhat steeper stretches, so that's where you want to utilize the 4x4 drive mode. When you get to the beach itself, don't drive onto the white sand as you are most likely going to get stuck.
As for the beach, so wide and secluded, you may be the only person or group there. It's not good for swimming or snorkeling at all as the currents and waves can be very rough, but it is good for sunbathing, photography or doing beach strolls from one end to the other. Very spectacular views of Molokai and Maui in the distance! So worth the effort if you are able to make it to Polihua Beach on the north coast of Lana'i. read more