Atlantis itself is w/c accessible but Disney does not have accessible transportation set up. There are some stairs, but there are also elevators so you would be able to do this tour with some modifications. You may need to set up transportation on your own and then purchase the tour once at Atlantis ( it should be around the same cost) or speak with Special Services in advance to see if, once onboard, the shore ex manager can arrange this for you. I know of several people using scooters or wheelchairs that have enjoyed seeing Atlantis and the aquarium, etc. Nassau has added more ramps to some of the stores in the downtown area. The last time we were there I could go into the Hard Rock store to buy t-shirts for my sons. I made sure to let them know how much it was appreciated and hoped they'd garner more business by being accessible. The little building you now pass through to get from the cruise ship area to downtown also has fully accessible shopping areas.---Kathy