Just finished building my new house and one of my requirements to the wife was a detached garage for my toys and beer fridge.
It is 36' x 36' with 11' height doors. I am going to start insulating and hanging OSB for the walls this weekend. The only negative is it is not on the water.
http://www.aarondenny.net/house/shop1.jpg http://www.aarondenny.net/house/shop2.jpg