Consider comments in an earlier reply to your March 2 post about the mechanics of exchanging: Re: Interval Exchange Hilton Head/Myrtle Beach
Keep in mind that Ocean Watch Villas is undergoing an expansion and there is construction going on. Villa availability is extremely limited unless you own there. Your best bet is to confirm the impact of construction by calling the club directly and/or checking TripAdvisor.com
Here's the announcement posted on the Marriott Vacation Club website for owners at OceanWatch Villas:
"Please note construction on the final phase is scheduled from February 9, 2009 through May 2010. While we strive to minimize the effect, guests may experience related construction noise, Monday through Sunday during the hours of 7:00 a.m. to 5:00 p.m. We thank you for your understanding and sincerely apologize for any inconvenience this may cause."