I disagree with you SailorJack... My daughter, her Aunt and her 3 sons went on the snorkel excursion in Alaska. They had a wonderfull time. The wet suit had a hood and gloves, so the only exposed part of you is your mouth area. It was really quite warm and at times, the boys said that they were working enough that they got too warm and had to unzip the wet suit enough to let some cool water in.
The reef they were on had lots of life on it since it had not been over run by tourists like in the Caribbean. If you like snorkeling, I say go for it.. I don't think you will be disappointed.
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