used up mine in ATL over the weekend. did the zoo and fernbank (only the IMAX tho (too tired for museum and dinner plans later)) on friday and GA Aquarium, next door to coke, and across the park to CNN on Saturday. we were definitely tired after we finished CNN. If you do the Fernbank/IMAX, don't see the Butterfly film. I feel asleep several times.
Each location has a ticket book they give you when you redeem your voucher at the first location. Do NOT tear out any of the tickets. Let the ticket agent do it.