My DD8 and I have done the Blue Lagoon, Dolphin Swim and Atlantis, and without pause we'd do Atlantis again in a snap. You're on vacation so $50/person for a full day isn't bad. Take into account that we love swimming and water parks, but we're actually thinking of going to Atlantis and staying there for 3 or 4 days. The walk across the street is short, but walking around the grounds of Atlantis itself can take awhile. Be sure everyone has shoes so you don't burn your feet. And lots of sunscreen! There are pools and grottos everywhere, so be sure and go exploring. You'll keep tripping over more pools or hideaways. Be warned that it's not a full sized waterpark, but more of a mini-park. The biggest cluster of slides and the tube ride through the shark tank are at the pyramid --- just ask anyone how to get to the pyramid. Our favorite slide was across the big bridge on the other side of the park --- pool, slide/drop, pool, slide/drop affair. Also, the Dig, their enormous walkthrough aquarium is a nice diversion that you shouldn't miss. There's a neat stingray pool, for looking, not swimming, fountains galore, an area where they've cut a channel and let the sea come in to make their own little white sand surrounded bay, and there's the real beach too. DD got her hair-braided on their beach - clean, polite, no waiting. We rank this as our best single day cruising ever - even ahead of CC because there's more to do! I recommend getting off the ship as soon as possible and heading out. Enjoy!