At Senor Frogs at Treasure Island, Las Vegas, NV, buy one entree and get an appetizer for free via this printable coupon, as provided by DestinationCoupons. (Select "Click here for your Coupon" to see the coupon.) Although we saw a similar offer for a free entree earlier this week, it's still free food! Reservations are not required; the coupon must be presented to your server. (It can be printed or presented on your smartphone.) Book this travel deal by December 31.