Mind your manners and keep your distance. A good distance is one where the moose continues to go about its life as if you weren't there. Part of the fun of watching big game is trying not to disturb your prey. Binoculars, spotting scopes, and telephoto lenses allow for viewing and photography at safe distances and provide stress-free experiences for both people and moose. Being quiet always helps.
Many people like to hear the variety of noises a moose can make.