Plan to visit a National Park during National Parks Week (April 17-25, 2010) because all entrance fees will be wavered.
Here's a way to combine your love of brackets with National Parks, National Parks Playoffs.
Want to learn more about nature and science? Consider attending the Public Lecture Series: Science in Action by the USGS. The April 7th lecture will be Wandering Wildlife: Tracking movement, migrations and mileage, from wolves to wading birds by Robert Gill and Dr. L. David Mech. Can't make it in person? The lectures will be available in video following each lecture.
Prefer active vacations? Check out this article on 4 National Park Adventures.