I found this online..we so enjoyed it when we visited Atlantis.
The Dig Tours & Admission Fee
Visiting Cruise Ship Passengers
One-hour Dig Tours are available to non-Atlantis guests and cruise ship passengers. The admission fee is approximately $29 per person; $21 for ages 3-11; and free for under 3. The fee also includes walking access to other areas of the resort's tropical marine habitat, home to over 200 species of live animals in 11 exhibit lagoons and pools.
Note: The fee does NOT include access to Atlantis Water Rides, Pools and Beaches.