My family has been to Alska 5 times, each time for 2 weeks. There is no shortage of outdoor activities, and likewise, a seemingly endless stream of books/guides/brochures/pamphlets to help you navigate through all the options. However, many of these publications are either way too general (for the cruise ship folks??) or way too specific (for the serious backcountry backpacker). Finding guides that provide great information for the more typical "weekend warrior" types is pretty rare. I found this on Amazon before taking our latest trip in July 2011. From the sample pages, it seemed to be exactly what I was looking for. It did not disappoint. After using it for 2 weeks, I lent it to 2 other families who visited Alaska last summer. They both agreed that it was extremely helpful.
A note of advice, especially to those visiting Alaska for the first time. Get this book and the almost indispensible Milepost. If you're visiting several areas of the state, Milepost will literally take you, mile by mile, to where you are going. Alaska has a ton of hidden treasures that you can easily drive right past without a guide to point them out. Milepost doesn't miss a thing! Order these 2 books. You'll be glad you did.