My wife and I own Vidanta villas and Grand Luxxe. We took a trip to East Cape to take a look and went to the visiting center for a presentation. We were shown before this trip a presentation of the East Cape and assumed it was ready. Not even close. Dirt road only. They promised by the end of this year it would be ready with hotel and the largest sea water pool in the world. Looking at Google Earth. I don't think it will be true.
When we upgraded to Villa (real estate) level we sold to Vidanta the RainTree timeshare. This was one year ago. They still have not take over the timeshare and made us pay annual fees, which was promises by Sales Director David Collomb to be done. Tons of emails to him and other senior members, still no payments and no Transfer. Be aware of this. I have spent tons of hours with Vidanta to resolve this issue. I hope they will refund soon and take possession of RainTree timeshare.
Don't buy RainTree. They gave us a not true information of hundreds of locations, but only a few belong to them.
If you search this forum you'll see that Vidanta won't ever actually take over your Raintree club. I believe they use a third party that wants $$$ to "do that" for you, but they don't really do that either.
Your best bet is to get Vidanta to cancel/refund the $$$ (I think that's what most folks have done) and keep the Raintree club yourself and then try to get rid of it yourself.
Basically Vidanta will inflate their prices by tens of thousands, claim your old timeshare is worth say, $20,000 and "buy it back" (but they don't actually do that) and take $20,000 off say, full MSRP.
You're then stuck with Vidanta and your "old" timeshare in most cases having to continue to pay the MF on the old one.
I have no idea how much Raintree is worth (if anything) as most Mexican (maybe most foreign) timeshares are RTU (Right to use) vs. deeded weeks like Marriott, Hilton, etc.
Good luck!