Pleas pardon my long-winded answer to your simple question...
We just returned from a four-day, 5/25 Wonder trip and really enjoyed Atlantis via Comfort Suites. We got a terrific rate of $157 using of all things - here's the crazy part - the discount code on the back of a Little Debbie's snack cake box! Might be worth the $1 to buy a box for the code. Anyway, a one-way cab for three to CS was $11. Checked in and walked the short distance to Atlantis. We loved the beach. The tide was not that bad and we cannot report any jellyfish. Of course, we're from Oklahoma so we probably wouldn't know one if we saw it. After beach fun, we stopped by the Atlantis towel shed to get our wristbands to ride the slides. What a thrill my DD 11 had floating her intertube through the shark tank. After all (as I learned that day), Mary Kate and Ashley did it. Oh, and I did the one-person slide through the tank. Very cool even for an old guy like me. That was about it. DW snuck off to the casino to play slots for awhile, but said it wasn't the best casino she'd ever seen. We were having so much fun that we never got around to the dig. But we did walk around the resort a bit and saw a lot of the fish -- Atlantis is a huge place. Then went back to the ship.
A few tips while Atlantis is fresh on my mind: 1) Don't buy the necklaces, bracelets, hair braids, sarongs, or any other trinkets from the CONTINUAL parade of hawkers on the beach. It's all overpriced. Instead, shop the straw market next to the port near the ship. Everything is about 1/3 what you pay on the beach. 2) Also, we used the suggestion from the disboards to order room service sandwiches the night before and took them with us. Worked out great. Turkey, tuna or melted ham & cheese are your choices. Put them, along with a couple of big island cookies, in one of those big zip loc bags that I know you'll be taking. Throw it all in your rolling cooler (another good suggestion we used) with some beers, waters and juices for the kids and you're set for the day. Don't forget to stop by the beverage station on deck nine for ice before leaving the ship. Hope that helps! Have fun, and, please, have beer for me at Senor Frogs.