The most accepted credit cards are Visa, MasterCard and American Express; the establishments taking credit cards usually have a sticker pointing this fact out at plain view; in any case, if you are not sure ask before consuming, in this way you will avoid misunderstandings and unpleasant moments.
So there is no reason to be worry and use them with total reliance; however, always carry some local cash with you, mainly for small purchases or to pay some services (taxis for instance), or in case you move away from the urban zones.
Is it recommendable to bring traveller checks?
Yes, because they are a practical, safe and simple way of getting cash, in view that they can be easily changed at the bank offices of Chihuahua.
It is recommendable to have the checks issued by institutions of international prestige, and preferable for large amounts of money.
How much should I tip?
Although it is not forcefully enforced, it is usual to leave between 10 and 15 percent of the bill at restaurants and bars, depending on the quality of the service.
Bellboys usually get a tip equivalent to one dollar for every day you stay at the hotel, while the parking valets usually get between one and two pesos.