Just tried to book a reward reservation for the Hilton Waikoloa in April 2012. They list several different premium room types and the points required but when I click on and "select" the premium room type, it gives me a message that the room type is not available and to select another room type. I went through and selected every single room type, and none were available! So why are the room types and corresponding point values listed if they are not bookable?!
