Las Vegas isn't really the idea place to come to Margaritaville. This place lacks the awesome ambiance that you can find in the Caribbean spots. Drinks are small and expensive, and the food is so-so.
Would have all been better if they hadn't thrown in a 10% extra tax for the band playing. Listen to a mediocre band, and $9 beers became $10 beers, magically. They expect that you are quite aware of this quirk before you sit down, or else it's a nice little surprise when the receipt comes.