* Most common tip: 15-20% of the bill

* What bartenders appreciate:

* A friendly and easygoing demeanor

* Being tipped in cash

* Not waiting until the end of the night to tip

* Not haggling over the tip

* What bartenders don't appreciate:

* Tipping with pennies or change

* Not tipping at all

* Being rude or demanding

* Trying to hit on the bartender while they're working

Servers

* Most common tip: 15-20% of the bill

* What servers appreciate:

* Being seated promptly

* Being treated with respect

* Being told when you're ready to order

* Not sending your food back (unless there's a legitimate reason)

* Tipping in cash

* What servers don't appreciate:

* Snapping your fingers to get their attention

* Treating them like your servants

* Not paying your bill

* Leaving a mess on the table

Cab drivers

* Most common tip: 10-15% of the fare

* What cab drivers appreciate:

* Being respectful and communicative

* Not making them wait too long

* Giving clear directions

* Tipping in cash

* What cab drivers don't appreciate:

* Being rude or demanding

* Not tipping at all

* Trying to get out of the cab without paying

* Making them clean up your mess

Hotel housekeeping

* Most common tip: $1-2 per day

* What housekeepers appreciate:

* Leaving your room reasonably tidy

* Not leaving valuables out in the open

* Stripping the bed (making it easier for them to change the sheets)

* Tipping in cash

* What housekeepers don't appreciate:

* Making a huge mess in your room

* Leaving food or drinks out overnight

* Not respecting their privacy

* Not tipping at all