Sitka is not a large town. You can do most tours on your own by walking.
Saint Michaels Cathedral mid town is worth visiting and the cruise lines do offer it as a stop on a tour. I believe the donation was $2.00 p/p on your own.
There is a rapture center that is very informative and not available through the cruise line. I recommended to some friends that think I'm nuts and really enjoyed it. Give it a chance. The fee to get in was very little. This group does wonders with birds of prey.
You can get an all day bus pass for a very reasonable amount that has many stops in Sitka. If you are lucky with the driver that person may even give you a narration.
The Russian tour is is good and enjoyable. Other than that, shop 'til you drop.
Sea of Cortez on Ryndam 9-28-2005
Round trip Los Angeles to Hawaii, Summit March 26, 2006
Vancouver – Alaska – Los Angeles, Sept 16, 2006 on Summit
__________________ Ready to Steer towards another cruise
Actually the Raptor Center is included on some tours. Request their visitor guide www.sitka.org
It is a very walkable town without mobility limitations, but they do have an all day loop bus for $7. A highlight here are the boat tours for whales, sea otters. This area also is the only likely place for puffins since there is a rookery on St. Lazaria Island, take a boat tour there. The Sitka Heritage park has a lever 1 mile loop trail past interesting totems, purchase the cheap guidebook, will really enhance the walk. The Archangles dancers are good if of interest.