Ahoy there, Wael!
Thanks for cruising by the Disney Parks Moms Panel with your question.
I've got to admit, my favorite Disney Princess has always been Ariel. I love her spirit, curiosity, and thirst for adventure! While I'm a big fan of
The Little Mermaid, I'm sorry to tell you that, for safety reasons, mermaid tails and monofins are not allowed in the swimming pools on the Disney ships, or on Disney's private island,
Castaway Cay. I visited the website you mentioned, and the tails are so pretty! I hope your daughter will be able to find a pool close to home where she can live out her mermaid dreams. I would have loved one of those when I was a little girl - how fun!
On the Disney Magic,
Goofy's Pool is for guests of all ages (as long as the littlest cruisers are toilet trained, as no swim diapers are allowed). Goofy's Pool is located on Deck 9, Midship. On Deck 9, Aft, you'll find the
Aqua Lab and Nephews' Splash Zone, a splash-and-play zone for little ones, ages 3 and under. With pop jets and water spouts, it's the place to be for tiniest cruisers that want to enjoy the pool deck.
I hope this helps with your planning. Have a magical day! - Diane W.