One of the most important things to know is, do you owe any money on your timeshare? If you owe a supstantial amount of money against it, it will be almost impossible to get rid of by selling it. Resale values for timeshare are only a fraction of the developers price. A quick search of Westgate timeshares on E-bay will give you a good idea of the true value of your timeshare. It doesn't do a lot of good to look at advertised prices as they often are not the true selling price.
If you owe a substantial amount, your best bet may be in learning how to use the timeshare and get some value for what you've paid. Many of us here bought our first timeshare through a developer and paid the price. However, we've learned how to maximize our ownership and squeeze every last ounce of value out of our ownership.
Once you learn how to actually use your timeshare, you could become like many of us and be hooked. Presently we own 7 timeshares and make good use out of all of them. Hotel rooms seem awfully cramped anymore compared to the size of the timeshares. It's also forced us to take vacations when our habit before was to work through our vacation time. I didn't want to waste $18,000 (what we paid for our first timeshare) so I made certain we set aside time for vacation. Now our vacations have expanded to the point that others at work are jealous of the places we've been. I keep explaining that if they'd just plan to take vacation, they'd be able to do the same thing.