Here’s a terrific overview of the Great Loop, and several mini-loops, from the National Geographic. Take a look: The great American road trip has experienced a resurgence during the pandemic. But there’s a downside: This summer is projected to feature crowded campsites, expensive gas, and no end to long lines and traffic jams. Luckily, there is another epic U.S. adventure that few know about—and even fewer undertake each year. The Great Loop—a year-long, nearly 6,000-mile journey through the eastern United States and Canada’s interconnected water passages—takes boaters counterclockwise from the Gulf and Atlantic Intracoastal Waterways to the Erie Canal, Great…