My husband and I are visitng Atlanta in March, we are not sure whether we need to rent a car? We are thinking of staying in a downtown hotel and would like to visit the Martin Luther King Jr National Historic Site and Birth Home, the Cylcorama museum, the aquarium, possibly the CNN Center and the World of Coca Cola. We would also like to visit Stone Mountain, is it possible to take a tour there? Can we do all these things by public transport? Any advice would be much appreciated.