1. dress very nicely. 2. the drinks are free 3. don't gamble what you can't afford to lose
and good luck! out there in sin city
The drinks are free
if you are playing a game. And tipping is expected even if you are drinking for free.
I highly advise no alcohol at the poker table unless you want to end up being one of the drunk tourist fish. If that's your game - have at it.
For your first time - take some time to walk around and see the sights. The center strip is a blast (City Center/Bellagio/Caesars/Venetian). My favorite "free drink" is to throw $20 in a video poker machine at the Book & Stage at the Cosmo and drink top shelf Scotch. Your mileage may vary.
Also, if you are in the mood, find a way down to the Freemont Street experience on a weekend night. The insanity of some of the folks is worth the trip.
Most of the folks around here prefer the MTT's at Aria and Venetian. The ones you will find at Excalibur and MGM are a bit too hyper-turbo format for your money. AVP is an excellent resource.
Good luck, keep your wallet close and your pants on.