My humble opinion: Life of pi analogy

The journey is the route to attaining a dream

The zebra, orangutan and cheetah are good and bad things you encounter along the way.

The tiger is the biggest hurdle to ur dream. And maybe, the tiger, as hinted by the story, is yourself. The weaker part of you which does not dare to chase after your dreams.

To fulfill the dream, You must be alert to the hurdle in front of you and keep on trying to overcome the hurdle. If the hurdle is your weak self, u must be constantly self-aware and don't let ur weak self convince u to give up.

They hurdle is a threat and obstacle to u fulfilling your dreams, but getting to know it better yet it helps you to grow, and 'accompany' you on ur way to fulfilling ur dreams. When the hurdle is your weak self, you need to learn to understand the source of this feeling of weakness, be it low endurance or low confidence or others, and to tame it and grow out of it. To constantly realising these weaknesses and to overcome themwill make u a better person and perhaps bring u closer to ur goals

The island which devours things at night, is your comfort zone. You may think you have tried hard and work hard enough, so you thought you have already made it so far thus it is okay give up on ur dreams now. But no, to give up means to be devoured by the island, to fall back to who you are again, to the same plight as before (death of dreams). So keep moving on until u have reached ur final destination. Don't be satisfied with what you have achieved thus far and decide to stop moving on. Keep moving.

At last, the hurdle will leave u

And you attained your dreams