You can't advertise in the forums so expect all the specifics to be removed. You can advertise in the marketplace. Mexican vacation clubs are almost impossible to sell especially if there is an AI fee to use. Most clubs also have a transfer fee and they strip some of the benefits on resale which make it worth less than the transfer fee. If you are looking to sell you need to find out what the transfer fee would be and the cost for the buyer to use the weeks and what exactly would be all of the benefits that transfer.
Sometimes the best place to sell would be to go to the resort using your week and catch those that just attended a presentation and bought (but could still rescind) or didn't buy because of the price but are still interested.