You need to have some very dark sunglasses that filter out uv radiation. Regular sunglasses don’t always do that. Also because of the glare off the water and snow it’s best to have polarized lenses as well. If you are not sure then go to an optomatrist for some advice on good ones.
Next time you post here go to the discussion board instead of this one. This is where most of the porno junk mail ends up and most people would read much here.
Hope you enjoy your trip. Where are you heading? Cruise or Mainland? Science trip or Tourist?