Each person has some quirk that makes them completely unique....
^All of this is boring, particularly the first few sentences because they are just general statements.
My knowledge of sailing was minimal at best, but by day four I was capable of doing what a year of sailing would have taught me. I discovered how to work together with my group to surpass any obstacles
^I think you start off with this, you have a more effective and direct opening, therefore can be more interesting as well. However, I do not see how working together has taught you to surpass ANY obstacles. 'Any' is a bit too broad and bold of a word here.
I think your ending is quite strong actually. However, the middle part is quite weak because you have just made statements that would require a bit more analysis and explanation so that your the validity of such statements can be justified.
provided profound concepts and enlightenment.
^What do you mean by this?
There are similar examples in your essay. Expand and develop these points.