For information on Fortress of the Bear, they are on Facebook, and have a lot of photos there. They also have a website at http://www.fortressofthebear.org/
If you have Facebook, also try out Sitka Bear Reports. It is a good site with photos of local wild bears, it is used by locals to keep each other informed on bear sightings in and around town.
Totem Park is a must see for tourists. As is the Raptor Center http://www.alaskaraptor.org/
We have a wide range of hiking trails as well, some are pretty hard, but well worth the time. Sitka Trailworks is a community organization that builds, maintains and has guided weekend walks on local trails. They are on Facebook, and their website is http://sitkatrailworks.org/
You can also do bike tours and rentals. These are for-profit so won't link to their pages. Sitka Bike and Hike can tell you about both.
Also several outfits rent kayaks in town, just don't know their names off hand.
This time of year it's fun to go to Starrigavan (sp?) Campgrounds. There is a boardwalk down on the wetlands for bird and fish viewing, also off that boardwalk is a bear viewing area as the salmon should be running still hopefully. Also in the campgrounds is a natural artesian well, with some absolutely incredible natural water.
Wherever you go around town, especially by salmon streams, be prepared and educated in how to behave around bears. There are quite a few here.
Just a few thoughts!!
Enjoy our little island!!