On my profile it says I have an unused reward certificate,
|03/24/2012||2012 Spring MegaBonus Free Night Certificate, Category 1-4 Hotel||—||09/30/2012|
I wasn't aware that I had one, and it expires soonish. I was trying to book a night using it to surprise my wife, but I can't get it to pop up the "Use certificate" option from the booking screen. If anyone could point me in the right direction, that would be awesome!