If you're staying in the Corolla area, there is a group that offers ATV tours of the area just off the beach where wild horses are found--we did this and it was lots of fun. I believe there are also several companies that lead sea kayaking tours (beginners OK) in and around the Pea Island Wildlife Refuge. We also took a dolphin spotting tour with a local marine biologist who gives them to raise money for his research--this was a neat trip and we saw *lots* of wild dolphins. Manteo has a small but very nice aquarium.