I will be going on NCL in early May and was wondering if it will be cold and I should bring a heavy jacket, sweaters and warm pants. Also, are the cabins stuffy inside and can you adjust the temperature? I hope the cabins aren't too small! I just hope I don't get seasick.
Yes, it will get cold on the decks. You will want to be there for the scenery. Layer your clothing is probably the best, you don't need to take a heavy winter coat, not good for packing. We went in mid June 2005 and it was beautiful. Take a pair of gloves. You will love it.
Definitely go for layers, with a waterproof windbreaker as the top layer. We did Alaskan cruise in May years ago. On one day, I was freezing on deck, the next I got sunburned. That's why layers are best. You can adjust to the really wide range of temp's. I carried gloves and a skier's headband in my pocket and ued them a lot.
You are not likely to get seasick, as the inside passage is usually very calm water. But, I am very prone to it, so I always carry meclizine, aka bonine with me. Most ships give it away at the purser's desk or the ship's doctor's front desk, but I need to take it at the very first sign...dizziness for me.
I truly hate being cold, but Alaska is worth anything. It is a truly awe inspiring trip. Enjoy!