I am renting a car to drive from Belize City to Tikal. Is the road to Tikal paved? I ask because if it is then I can use the insurance provided by my credit card. However, if it is not then I have to put down a huge security deposit. What are the chances of my driving on a non paved road??

Most unlikely that insurance on a credit card will be sufficient. In any case, the rental company almost certainly won't allow their car out of the country. The road from Belize City to the border is paved, but for quite a few miles beyond it is not.

The rental company I am going through does allow the car out of Belize. So I guess the best bet would be to put the security deposit down?

why not check with your CC company & see what the coverages are?

Don't do it. Rental cars won't let you take the car across. Dangerous stretch of road - bandits and potholes - lousy combo.