sister rock somewhere down in florida. where are you, phil? >> reporter: we are in the keys around the town of marathon. 50 miles from key west. this is going on the market more and more. your own private island. this is 1.7 acres. three bedrooms. two paths. with a price point of all these private island. you don't necessarily have to be a millionaire. this is like a little cruise ship that doesn't move. for bob and elena it's been a wind and solar powered paradise a quarter mile away from the mainland. >> a lot of peace and quiet if we want it. the on noise here is the ocean