The first place i pick would be Yellowstone National Park. Yellowstone was formed in 1872. It is the U.S. first national park. it is located in Wyoming, Montana and Idaho. There are many animals that live in Yellowstone such as grizzly bears, wolfs, bison,elk and many more. Old Faithful is also located in Yellowstone. They have a collection of the world's most extraordinary geysers and hot springs, and the Grand Canyon of the Yellowstone. When you go to Yellowstone you can hike,fish,take tours, go through hidden caves. Yellowstone's climate is one of cold winters and moderate summers. Most of the park is above 7,500 feet and the weather is unpredictable. Be prepared for changing temperatures, storms.
My second choice is Mount St. Helens. Mount St. Helens is a volcano located in Skamania County, Washington. It is 96 miles south of Seattle and 50 mile Northeast of Portland Oregon. It got its name from a british diplomat. It is manily famous for the eruption on May 18, 1980 at 8:32am. It was the most catostraphic eruptin in the United States. Fifty-seven people were killed; 250 homes, 47 bridges, 15 miles of railways, and 185 miles of highway were destroyed. After the eruption there was a debris avalanche. The explosion was so severe it made the north side of the volcano break off. Now in its place thier is a horseshoe shaped crater. The eruption made the volcano reduce 9,677 ft. The monument was made to keep the rest of the volcano to be studied for scientific purposes.
My third choice is Buck Island Reef. Buck Island, one of the Virgin Islands, is a great recreational site and attracts many tourists. It is 6000 ft. long, a half mile wide, and uninhabited. It is also the holding place for the Buck Island Reef. This national monument includes 176 acres of land and 704 acres of water and coral reef. The reef wad first protected in 1948, the area was made a national monument in 1961. It has many types of fish some are endangered such as Brown Pelican, Hawksbill, Leatherback and the Green Sea Turtle. There are many fish in the area, such as Parrotfish, French Angelfish, and Blue Tang. Concessionaires give half, and all day tours daily to Buck Island from St.Croix so you can enjoy snorkeling and other activities.The island and reef are great recreational spots, and atract many tourists.