We want to take the Aquarium excursion. The Disney website says "guided journey through the attraction." Is there something special about the Disney excursion, different from the general public in the Aquarium? I would have thought they'd just leave us there to enjoy the normal aquarium. Also, we have an elderly person, we need to move slowly through the aquarium. Would it be better for us to just take a taxi on our own from the ship to the aquarium? It turns out the cost is probably lower through Disney if you count the taxi fare.