What can I expect to find for my 19yo son on board the Navigator?
He would have free run of the ship and all activities offered for adults. Many of the activities, such as pool games, are geared toward young adults, so he probably would have a very good time. He also would have full access to the gym and the spa, if that's his "thing," and to the adult venues, including the disco, at night.
Sister line Celebrity Cruises has a drinking and gambling age of eighteen when the ship is at sea. I don't know whether Royal Caribbean International follows the same policy or a different one, but your son might get a real thrill from being able to order a drink at a bar for the first time if the same policy applies.
Also, 8yo sons?
They would find a full schedule of activities geared to their age group in the youth program.
There are also many activities such as ice skating and rock climbing that would be suitable for both age groups, and many ports of call have a lot of attractions for youth and young adults to explore.
Besides the obvious activities at the pool and ability to drink.... there are so many activities on board. Depending on what your kids get into... the sports deck is a huge hit with most kids. The rock wall, full size basketball court, volleyball, soccer, rollerblading, mini golf are all in this area. There is also the arcade. And of course, there is always just lounging at the pool and getting involved in the pool games.
Your 9 yr old can partake in nearly every activity that your older son can... and there is the Adventure Ocean program which has staff supervised activities throughout the day and evening, including scavenger hunts, arcade tourneys, teen disco...etc.
Two way radios are a great investment... and allows you to keep in touch with your kids on board
Another thing was mentioned in a previous post.... there are many things to do in the ports as well. Many people seem to lose common sense when on a cruise and do things they wouldn't do normally at home. Remember many ports are in third world countries where crime and poverty are rampant. Keep your kids safety in mind and recommend doing family tours versus just letting kids explore