"Snorkel" planning.

"I'll drop you off here and meet you at the lighthouse. Don't worry, it's closer than it looks." I squinted at the tiny lighthouse in the distance while I bobbed in the water. This was a few years ago on a snorkeling trip with my wife in the Caribbean. The boat dropped the two of us off near a reef in the ocean. Our instructions: snorkel towards the lighthouse where the boat would pick us up. So, we obediently stuck our heads underwater and paddled in that direction. I remember the radiant...