Is the hotel affiliated with a casino? Frequently when checking in you will get a coupon book with a gambling value of $50 to $200. So it might be worthwhile to check in and see what kind of coupons you get.

Also, if the room is free it can be very nice to have a room downtown and a room on the Strip. If you are downtown gambling you can take a break, use the bathroom and so forth. Just be sure to muss up the bed and maybe strow a newspaper around so the room will look occupied.