Hilton DoubleTree is running a special promotion with Topguest where if you sync your Hilton HHonors number on their page at http://doubletree.topguest.com, you will receive 500 Hilton HHonors points for free.
This offer is available to only the first 40,000 Hilton HHonors users who sync. From my understanding, you do not need to be a member/user of Topguest to use this promo. However, it does seem that if you have had your Topguest account suspended before (and you had synced your Hilton HHonors #), you will not be able to participate in this promotion. Sorry 🙁
Should be easy free 500 points!
Now, sync away before the points are gone! http://doubletree.topguest.com