Hi JLillie,
A good idea is to go to the Royal Caribbean web-site and check in, add all your information, travel plans, passport #, etc...You can also look through all the shore excursions for each port and get an idea of what activities you want to do. You can also pre-book any that you really want to do at a certain time. Even if you don't book any before you cruise, you can see what things there are to do in each place.