This is what you have to do.
Go to
http://www.royalcaribbean.com/gohome.do
and click on 'My Cruises' (top right by search). If you have already registered to this site (if not, you will have to register first), it will take you to a page where you enter your password, which will then take you to a page where your cruise will be listed. Click on this and you will find a link for you 'set sail' pass. All the items should be 'completed' before you try to print your 'set sail' pass. From memory, all it wants is stuff like name, address, citizenship, passport number etc. After filling all that out, you can then print out your pass (one for each passenger) and then all you have to do is present it at boarding and they will have your 'Sea Pass card' ready for you. Check in takes about 3 minutes!!, but if you haven't got the set sail pass, be ready to fill in loads of forms!!
Have fun!