If you want to visit Alaska, a cruise could be a very good idea. These days, it's a very popular way to visit the Alaskan region. There are many cruise companies which provide alaskan cruises, for example Princess Cruises. During your tour in Alaska, you will of course visit famous places such as the Glacier Bay (which is a National Park). Please note that you will only be able to make an alaskan cruise from May to September. During the other months, the weather is too cold to have a pleasant cruise.
