i finally figure out my mistake, titicaca-island of the sun

There was an abandoned Inca trail on the western side of the island. Part of the trail, I have to climb over the cliff like Indiana Jones. When I came to the top of the mountain, I finally figured out the old man was right but it was already 3:30pm (6:00pm sunset) and I was on the wrong side of the island. I have to make my way down the mountain where there was no trail and up the other side where the right trail was.