In the world of frozen alcoholic drink places this one is my favorite. You've got Wet Willies, Fat Tuesday, & a few other smaller spots but the flavors aren't usually very good. If you are like me & enjoy the taste of Red Bull & Vodka then go with the Up All Night drink at Numb.
Jeneane(Sorry if I spelled it wrong) was so friendly & chatted it up with us for a good 10 minutes while we tried samples of just about everything before finally deciding on the Up All Night. The samples are served in generous sized cups so you can really get a taste of whether it's going to be a drink you can see yourself sipping on for the next 5-30 minutes depending on how many brain freezes you subject yourself to.
We went to both locations, there is one inside Caesars Palace & another accross the street inside Harrahs. Both are nicely decorated & relatively close to one another. The cups are pretty cool & you get a discount if you bring it back for refills.
Unless you are sharing with more than one other person the 2nd size (30oz) is probably pleanty. I do recommend the extra shots as they aren't very strong without them.
In the extreme heat that is Las Vegas, this is the perfect beverage to cool yourself off as you walk the strip. If I recall correctly, the alcohol is not pre-mixed in so you can have them virgin also.