The queen's sister, Princess Margaret, tied the knot with Antony Armstrong-Jones (who upon the marriage became Lord Snowdon) in 1960, and they headed out on a six-week tour of the West Indies on the Royal Yacht Britannia, stopping by ports in Antigua and Trinidad among others.
As a wedding present, Princess Margaret was given a plot of land on the private island of Mustique in St. Vincent and the Grenadines. The island wasn't developed at the time of the honeymoon, but a decade later, a five-bedroom villa, Les Jolies Eaux, was built for the princess.
If you have $20,500 (during the off-season), you can have it to yourself for a whole week. Well, yourself and your household staff of a chef, butler, maid, housekeeper, and gardener.