" Mariner of the Seas is currently undergoing dry dock for routine maintenance and exciting, which will require some extra time for these upgrades to be completed."
Do they not proofread? It's undergoing dry dock for exciting?
1) He could be in AO for every single out they are open. No limitations
2) If you're on a holiday cruise, there may be some. Otherwise, hit or miss.
3) There will be age appropriate entertainment, typically the early slot for the various shows