Ключевые слова: activity, backpack, biologist, biology, botanist, class, couple, ecology, environment, excursion, expert, fern, flora, forest, friends, group, guide, guided, hike, hikers, hiking, interpretive, lifestyle, man, naturalist, nature, outdoor, park, people, plants, rainforest, research, science, student, students, summer, teacher, tour, tourist, trail, travel, trees, two, walk, walking, wilderness, woman, woods, workers, young,