Tinian
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The Pacific island from which the "Enola Gay" and "Bockscar" B-29 bombers took off on their missions to drop the atomic bombs on Hiroshima and Nagasaki, respectively.There isn't that much to see on the island, but the vast airfield and extra-long runway "Able", as well as the atomic bomb pits, from which the two bombs were winched into the planes' bomb bays, are still there. Other than that, there are various minor war relics and a "suicide cliff". The latter is a smaller scale equivalent of what happened on Okinawa: namely, that many Japanese preferred to hurl themselves off cliffs or blow themselves up with hand grenades than risk being captured.
Getting to the island isn't exactly a breeze. There are a few air and ferry connections to nearby Saipan, which itself is served by Japan Airlines from Japan (Tokyo or Osaka), or by a couple of US airlines from yet another island: Guam, which is in turn served by airlines connecting it to Hawaii or Japan. All of these other islands have their own WWII-related sites, so this kind of island-hopping is really only something for those heavily into Pacific War tourism. If you're only interested in Tinian, then the hassle is disproportionate.
For those interested in exploring these islands to the full, I would recommend the guidebook "The 25 Best World War II Sites – Pacific Theater" by Chuck Thompson.
Accommodation options on the island are sparse, but the Tinian Casino and Hotel that Thompson presumed would go out of business still seems to be there (TripAdvisor reviews include 2012 ones).
Location: part of the Northern Mariana islands in the Micronesia part of the Pacific, ca. 125 miles (200 km) north of Guam, 1600 miles (2600 km) east of the Philippines, 1500 miles (2400 km) south of Japan, and a whopping 3800 miles (6100 km) west of Hawaii.