Am not certain as to the veracity, but they claim to be the only property in the world with a privately-owned lighthouse. Nice beach and location in Playa del Carmen: http://www.hotelelfaro.com/
that lighthouse is on the cover of our Playa del Carmen map Click on the very important message on the opening page, they are closed for renovations right now. It does say they are reopening spring of 2007. It's a nice place right on the beach in Playa, great location.