Summer vacation is the time to relax, perhaps by kicking off your business shoes, grabbing a book or spending time with your family. This summer, my family visited the Upper Peninsula of Michigan, where we kayaked the crystal-clear waters, backpacked along Lake Superior and explored the remote beaches. We are happiest by the water and, fortunately, the Great Lakes provide plenty of opportunity to relax. I hate to even mention the Upper Peninsula for fear that people will start visiting there. What makes the UP so …