National Park Service Web Site

nps.gov
Check out this well-designed web site if you want to find a park by state, name, activity or topic. 
Activity includes everything from auto touring to wildlife viewing. The site also has information on scenic rivers, national heritage sites, memorials, monuments, historic sites, seashores, etc. so the topic search covers from American Presidents to Wildflowers. Other information on nps.gov includes news, events, photos and multimedia presentations and information for teachers and kids.