Yes, you need your passport.
If entering Mexico via airplane, yes.
Passport and permit
Yes. All you need is your passport and means of payment.
You always need a passport to enter another country
yes you do. you need a passport to fly anywhere outside of the United States.
If you are US, Canadian or European citizen you can enter Mexico without the need of a visa.
No, unless you are stopping at the US.
You will need your passport. If you are a Guatemalan national, you will also need a visa issued at the Mexican embassy in Guatemala City.
A debit or credit card. Cancun has it all: Wal-Mart, Sam's Club, and many other stores for your convenience. Also there are many small stores within most hotels, so you don't need to leave to get what you want.
Your state's DMV license is enough to legally drive in Mexico. For longer stays, you may need an International Driver's Permit (IDP), which is translated into Spanish and can help you while driving down there.
No.
8 years old. To drive a car you need to be 10