Before leaving Vegas, my friends and I always stop by Oyster bar for our last meal (depending if we won or lost money). We always come during the afternoon since it seems that the restaurant is not as busy as it would be at night and they have big screens playing all the sports games for the day so you can eat and watch at the same time.
We always get the same items: Oysters of the day to start off the meal, then the clam chowder, and its usually the Bourbon Jamabalaya or Sauteed clams in white sauce with linguine. There's also complimentary bread that comes with the meal which is great to dip in the clam chowder.
Since we travel in a group, we can order all this food and share but for those that are just traveling with their SO or couple of friends, get half a dozen of oysters, share the clam chowder and you MUST try the jamabalaya! Those three you have to try if you never been to Oyster bar before.