Years ago I found a very funny website written by a LV cocktail waitress. The bottom line was to:
Tip at least $1 for EVERY beverage (bottled water, beer, alcohol, etc)
Upon placing your order, GET YOUR TIP MONEY OUT (don't wait until your drink shows up because she makes quick drop-offs)
Don't try to help the waitress by taking the drink off her heavy tray, you may unbalance the tray and spill everything - WAIT FOR HER TO HAND YOU THE DRINK ... also, HAND HER any empties you have - don't put them on the tray itself
YES, it is okay to tip her with chips ... if you only have larger chip amounts, ask the dealer for some "silver" and push out a chip ... this is how you get "change" - but do this BEFORE your drink shows up!!
Don't ask the waitress for "change" if you only have a larger bill and/or chip -- you know you are going to be ordering drinks, make sure you have $1 bills and/or chips with you .... I ALWAYS make sure my DH and I have several because they can go fast in an evening ... LOL
The waitress will make a round to TAKE drink orders and then will return to DELIVER drink orders .... she will not be taking new drink orders during drop-off, so don't be offended if she blows you off or says, I'll be back in a minute
Remember that these gals work very hard. Sometimes they actually have to pay the casino to have their job ... so treat them nicely.