A common mistake many people make while traveling is drinking unfiltered water and ending up with an upset stomach. Though the tap water in Cancun does in fact meet the standards of safety, it is always a good idea to stick with bottled water.
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Most private hotels and restaurants in Cancun will have an on-site filtration system installed or offer guests drinking water that has been purified or bottled.
Although there will be some bacteria in the water from the tap it is fine to brush your teeth with, even if you are at a place where you can't drink the tap water.
If you want to avoid traveler's diarrhea, there are some simple rules to follow. First, forgo tap water and opt for bottled water instead. It may not be the best for the environment, but it will be better for your gut. Second, make sure you eat foods at the temperature at which they are safest to be eaten.
The best time to visit Cancún is from December to April during the peak season. Even though the crowds are heavier, you'll experience near-perfect weather and find some of the cheapest flight and room rates for a winter getaway at the beach.
Much like in the U.S., in Mexico, it is customary to tip service workers in restaurants, hotels, and Ubers. The standard tip is 10% of the bill, but you can give more or less depending on the quality of service. Tipping is not required, but it is appreciated.