If this helps, below is the URL for Marriott and Renaissance resorts in the Caribbean.

I don't know if it's maintained by Marriott, Marriott's Caribbean Division or the local owners/franchisees.

But what it does give you is a bit more detail on those properties including the St. Kitts Marriott Resort. And its webpage has an 800 number that will get you to a reservation specialist for that property.

Also, on the site's homepage is a link to "contact us" and past experience (w/the Curacao Marriott) indicates that the email addresses listed there do in fact, let you reach the individual property instead of Marriott's centralized reservations desk. (Worked for us when we were researching the Curacao Marriott.)

http://www.paradisebymarriott.com/