I'm visiting National Parks with my family this summer. I have two daughters, 7 and 11 years old, and we're camping in a Casita for 3.5 weeks, then exploring Alaska via cruiseship, B&Bs, and tent camping for 3 weeks. First, I'll offer a bit of wisdom: the Junior Ranger program in each park has been a great way to involve our 7 year old in getting out there and in learning about conservation. What do you do to keep your kids interested in exploring the natural world?