印第安纳沙丘是美国最新的国家公园

hike - v. to walk a long distance especially for pleasure or exercise

designate - v. to officially choose (someone or something) to do or be something : to officially give (someone or something) a particular role or purpose

superintendent - n. a person who directs or manages a place, department, organization, etc.

commercial - adj. related to or used in the buying and selling of goods and services

tourism - n. the activity of traveling to a place for pleasure

ecology - n. a science that deals with the relationships between groups of living things and their environments