My daughter gets so excited by the sight of a wild animal. We look for wild turkeys together; they usually stop by our yard in the early morning or late afternoon. This is a great activity for kids because you can teach them about the different animals, what they eat and how they behave.
When we go to the beach we love to watch the seagulls and hunt for hermit crabs. I have succesfully taught her to respect the wildlife by putting it back when we are done visiting with it.