Peggy and George launch their power boat, Spray, in Port Isabel, Texas for the trip of a lifetime as they cruise the waterways of America, specifically the 6000-mile route known as THE GREAT CIRCLE. It's a voyage of adventure, natural wonder, people, and friendships, but also a voyage of discovery exploring the lore of the waterway - the events, places, commerce, and ecology that shape the culture and consciousness of this nation.