Be sure to go to the Royal Caribbean site and input all your information. You should have a booking number, you will need that. Once you do all that, you can look through their excursions and get an idea of what is offered at both ports and see what you want to do. General rule, one excursion at each stop, also depends on how much time you are there. If you go ashore in Belize, be sure to make sure you have plenty of time to tender back to the ship...
If you should order room service, you may want to tip a few dollars to the person who brings it up, otherwise, all your tips are paid for, each time you order a drink or soda, they will automatically add another 15% on to the amount, then that will go on your sign/sail pass.
Feel free to ask all your questions..