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Hawaii Volcanoes National Park Location: Hawaii Volcanoes National Park, HI Length: 150 miles Difficulty: Easy to moderate Features: Rainforest, volcanic landscapes, sulfure

Hot Springs National Park Location: Hot Springs, ARLength: 22 sq. kmDifficulty: ModerateFeatures: hot springs, hiking, camping About the Hot Springs National Park Located in Garland

Indiana Dunes National Park Location: Chesterton, INLength: 4.7 miles in lengthDifficulty: ModerateFeatures: bicycling, birdwatching, hiking, fishing, beaches, paddling, sand

Isle Royale National Park Location: Houghton, MILength: 571,790 acresDifficulty: ModerateFeatures: campgrounds, UNESCO biosphere reserve, lake, islets, islands Isle Royale National

Kenai Fjords National Park Location: Kenai Peninsula Borough, Alaska Length: 4.5 miles Difficulty: Difficult Features: icefield, glaciers, fjords, terrestrial mammals, marine mammals   About the

Lake Clark National Park and Preserve Location: Port Alsworth, AK Length: 40 miles Difficulty: Moderate Features: kayaking, rafting, fishing, hiking and camping, sport hunting,

Mammoth Cave National Park Location: Louisville, Kentucky Location: more than 400 miles Difficulty: Moderate Features: sinkholes, underground rivers, streams and springs, spelunking, hiking,

Location: Mesa Verde, Colorado, United States Features: Guided and self-guided Tours, Hiking, Archaeological sites and artifacts, Camping About Mesa Verde