$5 at meals is more than enough. I'd usually leave a couple bucks in the room each morning for the maids, maybe leave more if it's messy
We like to find out what bar we'll be at the most and leave a nice tip early, because the rest of your trip they'll remember you and generally get some quick friendly service. If you're at the bar as much as us it pays off quick
After that a $1 or 2 every once in a while is appreciated. If you're friendly/patient and learn people's names you'll almost always have great service
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