Do whatever you can to get a discount. Military, local, or whatever. Just make sure to ask them about discounts. Now on a serious note. Should or should you not get the open bar car or not. If you want to knock a few back, pre-game, get drunk, etc... Then you need to get the drinking car. The bartenders are really fast and trust me you can do some serious damage during the ride. The cart without the drinks is cool too. Tip... Make sure you have a good place to stand near the strip before you get to the top. Everyone will try to take pics on that side and if you wait too long, you will miss out. The view is only good for 30% of the ride.
Pros - open bar for a good price, something different, location. Parking
Cons - Price without discount, amount of folks in a car.