A couple months ago I booked a stay at the Hilton Arc de Triomphe in Paris using points. Normally a 4 night stay would be 200,000 points (50k/night x 4 nights) but I booked using the 4 night chart that I have access to through the Hilton AMEX, so got the 4 nights for a total of 145,000 points, which I thought was pretty good! But anyway, long story short, we may have to cancel the trip, and I've never cancelled a Hilton award before, so I didn't know if there were any penalties associated with this (something similar to the "mileage re-deposit fee" that the airline is going to charge me when I cancel our flights), or if there were any cancellation penalties specifically because I booked the discount rate through the AMEX. Does anyone have any experience with this? Thanks!