We purchased tickets for the Hop-on, Hop-off Trolley Tour of Savannah at the bus stop near the visitor's center. We decided to do the whole tour to get an overview of the city, then to take advantage of the hop-on, hop-off aspect to visit some sights. Our driver, Charlie Brown, was very knowledgeable and explained various sights around the city. At a couple of the stops, actors climbed on the bus and give us historical information about the places we were seeing.
After doing the whole tour, we got off at the last stop and found something to eat. We later climbed back on the trolley for a trip to a couple of the houses/museums. I highly recommend this tour.