Passports and Visas
American travelers are now required to have a valid passport to travel to and from Mexico. Tourist visas are issued upon entry; you technically are allowed up to 180 days, but agents often issue just 30 or 60 days. If you want to stay longer, request the time when you present your passport. To extend your visa, visit the immigration office in Cancún.
No special vaccines are required for travel to the Yucatán Peninsula, but it’s a good idea to be up-to-date on the standard travel immunizations, including hepatitis A, MMR (measles-mumps-rubella), tetanus-diphtheria, and typhoid.
Cancún International Airport (CUN) is far and away the most common and convenient entry point to the region. A handful of flights go directly to Cozumel or Chetumal, and there are plans (but nothing more) for a new airport outside Tulum; there also is an airport near Chichén Itzá, but it is used exclusively for charter flights. An excellent network of buses, shuttles, and ferries covers the entire region, though a rental car makes a world of difference in more remote areas.
Excerpted from the Eleventh Edition of Moon Cancún & Cozumel.