In Vegas, Hilton does not have great hotels. Flamingo is well located but pricy and, if you do get a good deal, be sure to ask for a room somewhat near the elevators. We were lost in the labyrinth. There are at least 2 additions and not enough elevators to serve them. Th LV Hilton is off the track so you would need a car to have fun. The best deal, I think, is MGM Grand at $59/night and AAdvantage points. Also half off coupons for buffet and show. Nicer hotel, well located, and has some terrific restaurants.
On a Hilton note, if you are married, be sure to get a HHonors Mutual Fund so you and spouse can combine miles, points, etc from any source.