Since there are so many tours available I thought I'd do an overview first and tour entries later.
Most tours were available when we boarded ship so don't feel pressured unless you are determined to take a particular tour. We called daily until our booking number (required) was confirmed then used the internet to book excursions. Helpful features of this site are that brief descriptions of tours and notes physical activity required. Booking ends 10 days before embarking.
Tours can be pricey. Since everyone told us to be sure to take a plane the first tour we picked was a wildlife seaplane tour in Ketchikan. Tours were available by seaplane, helicopter and fixed wing plane - general prices ranged from $199-$300. per person. Tours are for wildlife sightings, glacier trips and just a flyover of inaccessible areas. Many of these flights, including ours, were cancelled.
Wildlife tours - ranged from nature walks and hikes to bus and boat tours. Prices range from about 39.00 to $80.
City and historical tours - ranged from about $29-$50 and include everything from walking to van/bus trips focusing on unique aspects of each stop (history, native crafts, flora & fauna).
Flexibility is required - don't be surprised if the tour is cancelled.
Others - rafting (whitewater, which we did, and sightseeing), kayaking, dog sled demonstrations, native exhibits, wildlife sanctuaries, gold panning, salmon fishing - quite pricey but rave reviews, canoe, jeep and even a snorkeling expedition.
Tips - I would encourage everyone to stop at the visitor center as soon as you get off the ship at each location. If you haven't already booked a tour you can probably pick one up locally and perhaps at a better price. Also grab the local city walking tour map and if you are into shopping pick up the "Welcome Guide" for shops and special deals.
Trips we took - (will do entries on each)
Ketchikan - everything cancelled. Could not even pick up local tours to our interest. Found plenty to do though.
Juneau - Wildlife Quest, Mendenhall Glacier Tour and Mt. Robert's Tram.
Haines - (detour) ferried on our own to Skagway.
Skagway - Park Ranger History Tour.
Valdez - Keystone Canyon Whitewater Rafting.
Seward/Anchorage - Begininng of land tour. Motor coach and McKinley Explorer Train, Wildlife Refuge, Native American Center.
Denali - Wildlife Tundra Tour and Cabin Nine.
Conclusion - There are tours available for every interest, opportunities to be independent and adventurous in your choices and the definite need to be flexible when weather throws a curve to your travel plans. The prices a quoted are for adults but many of the tours have children's prices. Some tours restrict children due to physical requirements.
I'd been told that the tours were expensive but none that we took failed to more than fulfill our expectations. Pictures and details to follow.