I received a couple of Marriott gift cards as a gift a couple of years ago and I have no idea how to use them. Like everyone, I book rooms online using my credit card. I really don't use in hotel services like restaurants or room service.

I tried to book a hotel on Marriott.com using the Marriott gift cards but I can't find anywhere to use them... the site only accepts credit cards so far as I can tell.

So what am I supposed to do with these cards? They seem downright inconvenient. I'm sure the giver had good intentions but honestly buying one seems like flushing money down the toilet.