Mountaintop

This is a story that starts with a man drowning. Luckily he survives, but he still finds himself stranded on an island with palm trees to offer him coconuts for food and drink. It isn't long before the island starts sinking. Again he experiences a stroke of luck as a manta ray comes into save him. He rides the manta ray to a strange island with a village in a forest and a mountain. He establishes a happy life in that village, but always finds a part of himself wanting to climb the mountain.