The capital of Guam is situated at the mouth of the Agana River and 5 miles north of the Apra Harbor, Agana's port of entry and the island's chief port.US citizens don't need a visa to visit Guam, or any other Micronesian islands. Oceania, island in the North Pacific Ocean, about three-quarters of the way from Hawaii to the Philippines. Guam is a tropical paradise, given its location, climate, and scenic beauty! It is home to elegant world class hotels, Asian PGA golf resorts, and beautiful beaches. The island's duty-free status means that name brand merchandise are often less expensive than its country of origin.