http://www.nps.gov/kidszone/

Crater Lake info:

http://craterlaketrust.org/science-and-discovery/facts-and-figures

http://travel.nationalgeographic.com/travel/national-parks/crater-lake-national-park/

http://craterlaketrust.org/

http://www.leg.state.or.us/kids/facts.htm

http://www.craterlakeinstitute.com/planning-visit/activities/index-activities.htm

Other national parks:

http://www.nps.gov/yell/forkids/index.htm

http://www.nps.gov/ever/forkids/

http://www.kids.gov/k_5/k_5_fun_recreation.shtml

http://travel.nationalgeographic.com/travel/national-parks/