Consisting of six tropical islands in the South Pacific, Hawaii is a picturesque visitor destination for people worldwide. Here, travelers can enjoy the tranquility that comes with strolling along the beach at night or the thrill of outdoor activities like hang gliding and surfing. On the Big Island of Hawaii visitors are treated to the United States' only rainforest zoo, the Pana'ewa Rainforest Zoo. Oahu, the most populated of the islands, features the world-class resort city of Honolulu and several well-known beaches like Kailua Beach and Waikiki Beach. The island of Maui is another popular spot, harboring two dormant volcanoes and boasting activities that range from biking to whale-watching. Enclosed by more than 100 miles of Pacific coastline, Maui's destination towns include Kahului, Kihei and Kapalua. The remaining islands—Lanai, Molokai, and Kauai—offer many other exciting activities including scuba diving, snorkelling and boat tours.