I was wondering which would give me a better chance at an upgrade. I am heading to Vegas this Saturday for a 6 night stay in a CP Forum Tower Deluxe King room. I am paying for the first night but the rest are comped. I made Diamond status (barely) earlier this year and have never used a separate check-in for an elevated tier level. So, which would give me a better chance at an upgrade? Should I go to the standard check-in line and slip a $20 to the person who checks me in? Should I go to the diamond check-in, where I assume I would be dealing with a host? Should I tell them how it's my 30th birthday and hope they toss me a nice upgrade? Thanks for any and all responses.