At restaurants, 10 to 15% is standard, but check to ensure a tip has not been included in your bill. Be sure to differentiate between the 15% tax and a tip. Bellmen usually receive about 3 pesos per bag and maids 4 to 5 pesos per day. It is not necessary to tip taxi drivers unless they have rendered special services, such as waiting while you go into a store or business. Tour guides should be tipped for a tour well done. The young boys and girls at major supermarkets typically receive 50 centavos to 1 peso for helping bag and carry groceries - they receive no salary. Delivery people (farmacia, pizza, fast food, flowers,) should also be tipped.
In a restaurant, the waiter will never bring you your bill without you asking for it first. It is considered insulting to bring it without you asking because it would be telling you that it is time for you to leave.
Tipping: just like at home...15-20 percent
Respecting the culture: Keep in mind, you are dealing with some of the nicest people in Mexico. They love to practice their english on you, and appreciate your patience with them.
Money: Its a good idea to have your money changed instead of paying with US dollars. The exchange rates are lower and more reliable in a money exchange place then at the restaurant or in the store!