Honopu Beach, Hawaii, USA
For absolutely remoteness and tranquil isolation you need to visit Honopu Beach along the Kauai Na Pali coast in Hawaii. This place is so off the beaten track you can’t get to it by car, bike or even foot. If you want to visit you had better dust of the swimwear and flippers as you will be swimming to it (take care, the current can be strong).
It’s worth the swim though, there are actually two beaches, set against a backdrop of towering sea cliffs and split by the Honupa arch. As an added delight just round the bay you will discover a majestic water fall. Time to pack the bags and feel the sand between your toes.