I have long been in love with the Utter Inn, a cherry-red hotel sitting smack in the middle of a Swedish lake. As you fall asleep, you can watch the fishies in the underwater bedroom; when you wake up, you can swim or row an inflatable canoe into town!
Well, now I'll be adding this floating house (in the Midwest, no less!) to my daydreams, too. See more photos here. Awesome.