You might want to head out to Mount Errigal for some fresh mountain air and a bird's-eye view of Dunlewy.
If museums are on your list of things to see in Glenveagh, then you might want to head to Glenveagh Castle. It's also full of great shops and restaurants, so you can spend the afternoon having a wander. If you want to experience more of the culture Glenveagh has to offer, head to Glebe House, Gartan Outdoor Adventure Centre, and Glenveagh National Park.