Lake Michigan is a really big lake, last time I looked. Its not the biggest lake in the world, but whenever I'm near or on it, it may as well be the biggest. Residents of Michigan, Indiana, Illinois and Wisconsin all enjoy the pleasures of boating and swimming on/in the lake, not to mention fishing or the lake as a source of drinking water. Please feel free to add relevant sites to the list and improve the summaries of the sites you see here.