There is no resale market for Sheraton Vistana Resort, so most likely, you would have to give it away.
Here's how to do that on TUG:
There are two places on TUG where you can give away your TS's for free (no charge for the Ads.) There are other cheap and free sites on the internet, as well.
TUG Marketplace - the only cost is your TUG membership - $15 (List it for $1 and it will automatically go in the Bargain Basement Ads.)
Bargain Deals - Totally FREE! - just write a simple post with all the pertinent info. In your post, include the following info.:
-resort name
-unit size
-season owned
-maintenance fee
-current reservations
To make it more attractive I would:
1) Pay the 2012 maintenance fees and don't ask for reimbursement.
2) Pay for the title transfer (you can get a simple title transfer with no escrow or title search for about $100.) Many people have used Tugger TTT (Alan) at Time Travel Traders for this service in the past, but he is retired and is referring most business to Lisa Short for this service - 1.706.969.8906
readylegal@gmail.com Lisa has been receiving good reviews on TUG.
3) Reserve a popular holiday week in 2012 for the new owner
Good luck!