Most ships aren't using tickets for the ice shows anymore. Just go down to Studio "B" about 20 minutes before the show starts. There's more than one day for the ice show in case you happen to miss one.
Thanks Sonny. I guess I'll find out either way what happens, if they require tickets or not. I saw in an earlier cruise compass as of October 2009 they were still doing tickets.
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2007 - Majesty of the Seas
2009 - Enchantment of the Seas
2010 - Freedom of the Seas