I've copied this from the NCL website. Hope it helps. Alaska shore excursions are really expensive, so this is where you really need to plan. NCL has a price list for their shore excursions on their website. Here's the excerpt from NCL:
What does my cruise fare include?
Your cruise fare entitles you to accommodations, meals and entertainment aboard ship. Certain specialty restaurants are available with either nominal cover charges or fixed price menus and à la carte pricing in addition to the standard dining program. Items of a personal nature are not included, such as alcoholic beverages and soft drinks, spa treatments, certain specialty exercise classes, laundry, photographs, casino, ship-to-shore phone, e-mail, Internet, fax and Shore Excursions (including all Dive In™ programs). Government taxes and fees are also not included.