I thought sandals would be appropriate but by the end of the day my feet were fairly dirty - and exploring ruins was slightly uncomfortable due to gravel. Bring a pair of sturdy walking shoes.
Toiletries and Medical Supplies: Be sure to bring sunblock - the sun is strong.
Miscellaneous: Brought along immodium and pepto bismal but didn't need to use it - you should bring it just in case.
The hurricane season usually occurs between June and November. Travellers to the coastal zones should keep informed of regional weather forecasts and plan accordingly.
México has more than 50 airports served by regular passenger flights. Mexicana and Aeroméxico serve the major cities, and smaller regional carriers go to the smaller cities. Fares vary, depending on the popularity of the route, but are generally high. Train service is a practical alternative on some routes. Ferrocarriles Nacionales de México (FNM), the national railway, is heavily oriented toward cargo, and passenger service can be unreliable and uncomfortable. But FNM also offers a first-class service, called primera especial, on selected routes using modern equipment. These services are comfortable and inexpensive but are still relatively slow.
Watch out for that rainy season! Just because you're in southern Mexico doesn't mean you won't want warm clothing...it gets real chilly and wet!
Toiletries and Medical Supplies: Make sure you've got what you need, but it's not hard to get ahold of new things when you run out. Gigante's a very American-looking store, and great for buying all kinds of things.