Selene03 wrote:
I am guessing you don't want to be loaded down with lenses, but you will be there in whale season. You can see them from the shore, but I would highly recommend going out on a whale watch boat. They are not allowed to get that close to the whales, so your 100-600 might be a good bet. There are also many gorgeous scenes where you will want a wider angle lens. I have not had much luck with birds there. It's a beautiful island!!! Enjoy your trip.
When we went out on a whale watching trip in Maui, the whales were so close to us I put away my DSLR (which had the 300mm lens on it) and took out my point and shoot, they were so close. In fact the whales went under the boat: