First off, I would like to state that this review is coming from a teenage point of view. I was 15 (actually, I turned 15 on the first night) on this cruise. This was my 6th cruise, having previously sailed with the Big Red Boat, Disney, and Royal Caribbean. This was my first Princess.
I'd also like to say that I'm leaving this review because when i was searching for reviews, I couldn't find anything from a kid's point of view. I had no idea what the teen center was like, or what there was to do on board for anyone under 21.
My family started the cruise after having already spent a week on land, in a package with Princess. It was one of the best things I've ever done. We went on the Heart of Alaska Princess Cruise tour. We visited Fairbanks, Mt. McKinley, and Anchorage, traveling in between the hotels by exclusive Princess trains. Everything we did was done through Princess, so we had no problems knowing where to go or anything. I highly recommend doing this tour it is so beautiful, and informative. I also recommend doing the land portion first, because it makes sense. First, you do the more strenuous, traveling portion, then you go on the relaxing cruise. As an added bonus, they were having troubles with the trains going from Mt. McKinley to the Anchorage. We had to take the bus. It actually took us about 3 hours lees time to get there, and each person got $75 ship credit. Handy, if you want to buy something from the ship store. Things are a little pricey.