We've done the Natural Pool hike several times. We take the shorter, easier hike from the Pointe Blanche area and there is a longer hike from Guana Bay. This is a good youtube video showing the route we take - Tidepools. If you plan to get in the tidepool, wear sea shoes as there are usually sea urchins along the rocks. I made a word document that has the driving directions to get to the starting point. If you want a copy of that let me know.