Las Vegas Boulevard, labeled the first expansion for Las Vegas, includes several modules that players can use individually or in combination, specifically:
Eight dice in two new colors to allow for up to seven players.
A grey die for each player that allows you to remove an opponent's die when placed (with enough gray dice to have up to eight players).
A large die in each color that counts as two dice when determining who scores at a casino.
Rules for playing a solitaire version of the game.
Bills worth $100,000.
Bills worth $10,000 for each color of bill you collect.
One-shot action cards, with each player receiving one such card at the start of each round.
Special cards of variable value that are available in a new, seventh casino; on a turn, a player can place all the dice he rolled of a single number in this casino, but then no more dice of this number can be placed in this casino by any player.
(Note that Las Vegas Boulevard was initially announced as Las Vegas Lights and later renamed Las Vegas Plus.)