Tipping is an essential part of American culture and you should expect to tip:
Bartenders: 15 to 20% per round or $1 per drink.
Hotel maids: $2 to 4 per night, leave it under the card provided.
Waiters/Waitresses: Typically tip at least 20% on the total cost of your meal, unless it’s already charged on your bill.
Taxi Drivers: Tip 10-15%, rounded to the nearest dollar.