No beaches. Are you kidding? The water is 40 degrees.
But yes, they do heat the pool water and close the "dome" to create an indoor pool area. Otherwise you still need a suit if you plan on using the spa's or jacuzzis.
You CAN do snorkeling in Alaska, but they put you in a full body wetsuit to do it. My daughter and her cousins went and they had a blast.
Carnival Cruise Lines:
Fantasy 90, Celebration 95, Victory 05, Conquest 05, Spirit 6/06, Freedom 6/08, Holiday 7/08, Victory 6/09, Valor 9/09, Dream 6/10, Splendor 8/10,Conquest 8/11,Magic 11/11,Triumph 4/12,Spirit 7/12,Freedom 11/12, Triumph 2/13 - The fire cruise
NCL Dream October 2006, RCCL Mariner OTS June 2007