Is it recommendable to bring traveller checks?
Yes, because they are a practical, safe and easy way of getting cash; bank offices in Monterrey fully accept them, same as the most important hotels and travel agencies in the city.
It is recommendable to have the checks issued by entities of international prestige.
How much should I tip?
Although it is not an obligation, it is usual to tip 10 percent of the bill - without considering the tax to the aggregated value (IVA) - at the restaurants; this amount might augment or diminish according to the kind and quality of the service you get.
It is not usual to tip taxi drivers, but we do so with bellboys and the parking valets at hotels and restaurants.