more info including promo code here:
http://www.dansdeals.com/archives/4715
this is the same code given to me by PTS agent. she told me that you can only make 2 nights at one of the properties. the above link implies 2 separate reservations at 2 properties (maybe with two cards).
I made 2 night in april... please post your experience regarding previous posters question about having something to prove it in email/mail from the hotel