Sure. You can take a cab or the water taxi over. Shopping, the casino and some of the restaurants will be available. You can also wander around the Marina Village. Essentially, any of the stuff you see in the beautiful ads for Atlantis is not available without a pass. They do offer day passes for the aquariums at @ $30 a person.
GET UP TO A $1000 SHIPBOARD CREDIT AND AN EXCLUSIVE GIFT!
If you make your Disney Cruise Line reservation with Dreams Unlimited Travel you’ll receive these incredible shipboard credits to spend on your cruise!