In that case, I suggest you bring a copy of the attached map of Hartsfield-Jackson Atlanta International airport
with you. Zoom into each concourse until you can see the gate numbers and print out each concourse separately. That way, you can easily plan out the route from one gate to the next.
Also go to the Delta site and print out or write down any flight numbers later in the day in the rare event you miss your connection. It makes rebooking easier. Tell them you are on a cruise... it usually helps. The good news (yes, there is some), is that you are getting there early enough to account for any delays.
Also, please buy insurance, particularly a policy that will cover you for travel delay expenses and, more importantly, trip interruption (in the event of injury, med flight, transportation home, etc.).