Want to live as the Carnegies did? You can either make a few million dollars and buy your own island, or simply stay in this romantic mansion built in 1900. The gorgeous rooms seem to have leapt out of an interior-design article on how to best mix an old oaky aesthetic with contemporary design. Two-night minimum stay.
The rates are high, but they do include use of bicycles, kayaks and other equipment, three meals each day, and guided tours of the island.