My question involves a traffic ticket from the state of: GA

I am originally from NJ and was in GA for business.

The police officer pulled me over saying that I was going 90 in a 55 mph. I was not familiar with the area and I do not think I was going that fast. The officer asked if I wanted an accuracy check and not being too familiar of what that entailed I agreed. He returns back to with the ticket and says to call and find out my fine in about a week.

The questions I have are:

Should I go to court and fight the case?
Should I pay the ticket about ($300+)?
What happens if I plead and am found guilty?