There is a building at Sonesta Great Bay that is timeshares and we looked into staying there a few years ago with an RCI exchange. We chose not to stay there because we didn't care for the location and the optional all-inclusive fee for RCI exchange guests was expensive.

I don't know the history of the Great Bay property but I'm guessing based on the name that the timeshare building was or still is affiliated with the Royal Islander resorts in Maho. According to the website below, there are 16 timeshare units at Great Bay.

http://www.royalislandergreatbay.com/