Donate for a Cause will charge you thousands of dollars to "take your timeshare off your hands." No company will accept a timeshare for free, unless it has a definite resale value and they can flip it quickly.
I noticed that you posted it on the TUG Bargain deals forum back in March, but you haven't added anything since then. In this economy, you should be "bumping" your post to the top once a week if you really want to give it away. Posting it once won't do it, because your post is now buried pages and pages back on that forum.
If you really want to give it away, you should be actively marketing it on as many cheap and free websites as possible.