I think most, if not all, of the Royal Carribbean ships that have skating rinks use real ice. The rinks are very small, of course, but the shows they put on are impressive for the size.
Also, as golden mentioned, cruise guests can use the ice as well. Most sessions are general ones, so you will be sharing that small ice with people who are new to skating who are using skates they got from the cruise line, but if you remember to bring your own skates, there are special "advanced skater" sessions you can participate in where there will only be a handful of people on the ice if even that many.
Also, as golden mentioned, cruise guests can use the ice as well. Most sessions are general ones, so you will be sharing that small ice with people who are new to skating who are using skates they got from the cruise line, but if you remember to bring your own skates, there are special "advanced skater" sessions you can participate in where there will only be a handful of people on the ice if even that many.