I've read this a few times. Take a look at this site: >>>
Comfort suites
It includes this statement:
Comfort Suites Paradise Island Guests are also entitled to full use of all the facilities of the Atlantis Resort and Casino and signing privileges in their restaurants and lounges.
Comfort Suites Paradise Island Guests are entitled to all of the Atlantis Resort and Casino's complimentary features including
Casino
Pools
Beach
Chaise lounges and towels
Waterslides
Lazy River Ride
Entrance to "The Dig" depicting the lost continents of Atlantis
Predator Lagoons
Basketball court (at the Recreation Centre)
Beach volleyball court (at the Recreation Centre)
The following features at Atlantis are available to Comfort Suites Paradise Island Guests for a fee. Please call Atlantis Resort and Casino for information and prices
Water Sports Centre (at the Beach)
Spa at Atlantis (full service spa and beauty salon)
Tennis (available at the Atlantis Recreation Centre)
Discovery Channel Camp for children
If you google "Comfort Suites Nassau, use of ATlantis facilites" There are several hotel booking sites that say the same thing. Prices vary, 150 to 200 for a one night stay.
And that's where your problem lies. If you book for a one night stay, check in is three pm. If that's the soonest you can start using the facilities, your day will be mostly over before it begins, as you will have to head back to the ship soon after.
I didn not see any mention of a daytime only stay, or early check in arrangements.