Alaska Rainforest Sanctuary is a guided nature attraction south of Ketchikan, set in the wet temperate forest that makes this part of Southeast Alaska so lush. Trails, boardwalks, and viewing areas focus on forest ecology, salmon streams, birds, and the chance of seeing wildlife in a managed setting.
It is more structured than simply walking into the woods, but that can be useful in Ketchikan, where many visitors arrive by cruise ship with limited time. Go for an accessible introduction to rainforest habitat, and keep expectations realistic: wildlife is never guaranteed, but the forest itself is the reliable star.