Ключевые слова: activities, activity, alone, bicycle, bicycling, bike, boy, caucasian, child, cycle, cyclist, day, enjoyment, forest, fun, happiness, happy, healthy, helmet, hobby, kid, midday, nature, one, outdoor, outdoors, outside, park, people, person, recreation, ride, rider, riding, riding bike, season, smile, smiling, sport, spring, summer, sunlight, sunny, trail, vacations, wheel, wood, young,