Second the suggestion to eat at the Flying Biscuit Cafe. Several locations, including Roswell Road sort of near Perimeter. Use a GPS to route you. Roswell Road is always crowded.
Coca Cola museum is overrated. Georgia Aquarium is worth the price. You can get in free at aquarium on your birthday with proof of DOB.
Hot Krispy Kreme doughnuts will change your life forever. The doughnuts are made in each store, and a marketing genius came up with a Red Neon flashing sign “Hot Doughnuts Now” when they are making them. You can watch the staff pick the hot ones off the line and put them into the box for you.
There are pockets of green all around the metro area, so check out each area and google for parks, trails, etc.
IKEA store downtown is a fine way to waste time and spend money. Great restaurant, and at the checkout are they also have a small cafe to sell hot dogs and ice cream and sinfully delicious cinnamon rolls.
The Varsity Restaurant in Atlanta near Georgia Tech campus is a real Atlanta landmark famous for drawing all the big name politicians. You will find signed photos on the restaurant walls. Very greasy food, hamburgers and hot dogs. And the staff yells at you “what’ll you have?” As their greeting. This is their way of getting orders quickly because there is always a crowd. Frosted Orange drink is top seller. Onion rings are the best. But you will need a bottle of tums if you eat there. Delicious going down, though.
Fox Theater is another famous historic landmark, but you most likely won’t have enough time to devote to attending a program or concert there.
Six Flags over Georgia is a great amusement park on west side of metro Atlanta, but again may take more time and energy than your baseball players can afford.
Lots of small suburban towns have a nice ce town center with grassy fields to throw frisbees, or water splashing fountains for kids to run through. Movie theaters show cheap priced family movies during the summer. Check out Atlanta on the Cheap website for current listings of concerts, movies, plays, etc.