Hard to suggest without knowing your interests, but if you intend to stay in the city and not rent a car, a recommended longish sort of day in the winter might be:
- A "navy" sort of "lad" might actually like the
Georgia Aquarium. At least it would be indoors during a winter day
- Take the transit to Decatur, a city east of downtown (about 15 min transit ride). There I would:
- Hit the Brickstore Pub.. go upstairs to the Belgian beer bar
- Hit Iberian Pig or another local eating place
- Go to Eddies Attic and catch a (music) show
- Hit the Brick Store again or another of the pubs for a nightcap
There are other areas that are worthy of exploring. Hope you enjoy your visit.