There will be plenty of time for your daughters to use the rock-climbing wall. At times it can be busy where they may have to wait in line....but it's well worth the wait...not only is it adventurous...but the view is amazing once you reach the top!
There are certain times while on board where there are different times throughout they day when there is open-skating..it's not offered every day but there are so many other things to do on board when ice-skating isn't offered. Also don't miss the ice-skatng shows...they are incrediable! The shows are free but you must pick up your "free" tickets at the Pursers Desk ahead of time because they only give out so many tickets to accomodate the seating in the theaters.
Another great RC ship is Adventure of the Sea...the only down-fall is you have to fly into San Juan where it sails out of...but the ports are wonderful! Enjoy your cruise!