Your route takes in some great places. It would help if you could be more specific as to what you are looking for - great nature, culture, architecture, UNESCO

Your route takes in some great places. It would help if you could be more specific as to what you are looking for - great nature, culture, architecture, UNESCO world heritage sights, beach, food, people, etc. A few things that come to mind, concentrating on AsiaPac: * Angkor Wat in Cambodia and Borobudur in Indonesia are temples worth seeing. Luang Prabang in Laos too, though maybe a bit overrated. * Central coast of Vietnam has several nice spots (eg Hoi An). * I'd not spend too much time in Seoul, but consider visiting the bizarre DMZ. Why so much time in Japan? * On the way from East Asia back to the West Coast, consider stopping by in the North Pacific: Palau (beautiful nature and great diving), Yap (manta rays and stone money), CNMI (WW II sites, such as the place where Fat Man and Little Boy were loaded on the bombers), FSM, etc. There's the Continental "Island hopper" that covers these (and only rarely undershoots the runway). * I'd also recommend the Middle East, eg Iran, but this might not be a good time. And consider Eastern Africa.