One thing that is consistent across all the hotels available at Atlantis, is the access to the beaches, aquaventure water park, and the marine aquariums.
Considering a non-Atlantis guests will pay around $135 USD for a day pass to Aquaventure water park and Atlantis' beaches, you might even consider your room to be quite value for money given that access to these facilities are inclusive of your room price (even the value option of Beach Tower).