Found out that when you book a room on this site (Las Vegas Direct) they give you a free $25 dining certificate for anything over $500, and $50 for a booking over $1000. Not all hotels give it, but you will see it listed if it is offered (most of the major ones have it). You then need to redeem them at DiningDough.com, but lots of restaurants are available. You can also use the certificates to buy stuff from online stores, like Mrs. Fields cookies, Boca Java, and other places.

It is like getting 5% off compared to the hotel website rates (when you add in the coupon). If you check, the hotel rates on Las Vegas Direct look very good too, with some being lower than the hotel websites on a few that I spot checked, so that coupled with the certificates is a really good deal if you are planning a Vegas trip. I did not see any expiration date on this offer.