I’d vote Japan. Kyoto and Hiroshima are def worth a visit (Miyajima island in front of Hiroshima if you have the time). Nara for the deer and Buddha statue. Osaka to see another big city outside Tokyo. Kobe can be nice. Yokohama for the aquarium. Some onsen town at the foot of mt Fuji. Heck, seeing all of Tokyo in a week can be challenging!