Las Vegas is a city that runs on tips. Once you hit the ground in Las Vegas, you start tipping. Love it or hate it, that's the way it works. Since its the best way to get good service, and these are real hardworking people, you tip for service. Most of the people giving you service depend on your tips to make a decent living. They have families, just like you. If you get good service, tip the person.
Here's my TIP: Get $20 in one dollar bills before you leave home and you'll be ready for any situation.
The proper amount to tips: Bartenders or cocktail waitresses, $1.00 per round for one or two people. If you want your cocktail waitress to keep coming back regularly, tip more and they'll come around and even beat on your machine for good luck.
Bellmen: One or two dollars per bag. Tip more if they are really heavy or give you extra special treatment.
Taxi drivers: Minimum of $2.00 or 15% whichever is more. Tip more if its a longer route or they give you information pn good restaurants or directions.
Change people or Keno runners: A dollar or more, tip more if you get a jackpot and they spend time paying you off.
Valets: A dollar or two each time you park or pick up your car. If you want up front service, tip a LOT more and you'll get special handling.
Limo drivers: $5.00 minimum.
Hotel maids: A few dollars a night to clean up your mess. I tip every day so the person doing the work gets the tip. If you request extra shampoo or soap, put the request on the bathroom sink with a couple of dollars and you'll find a lot of extra products. The maid can also be your best source of information about the hotel. I was staying at the Bellagio with one of my employees for a convention. I was in the casino, she was napping. The maid gave her a tour of a high roller suite and gossip on the celebs staying there. Turns out Brad Pitt was spotted there while they were filming Oceans. The maid told her that celebs use different entrances than we do and we'd never see him. We didn't. Wahhhhhhhh.
Room service: Sometimes it will be added to your bill. If not, 15 to 20% of the bill.
Housekeeping for extra service: If you request a refrigerator or extra pillows, tip a couple of dollars for their efforts.
Shuttle service to the rental car building: Since they will handle your bags for you and put them on and off the bus, I tip a dollar or two per bag.
Airport check in porters, curbside check in: $1.00 per bag will insure your bag gets on the right flight.
Restaurants: 15 to 20% of the bill. Large parties of 8 or more may have the gratuity added to the bill.
Buffets: Minimum of $1.00 per person to your waitress who brings you drinks and extra napkins.