May:
21-25: Tokyo (travel to Yokohama on Friday afternoon)
25-27: Yokohama (travel to Osaka on Sunday afternoon)
27-29: Osaka (travel to Hiroshima on Wednesday morning)
29-30: Hiroshima (travel to Fukoaka Friday afternoon)
30-2: Fukoaka (travel to Nagasaki Sunday afternoon)
2-3: Nagasaki (travel to Hokodate Monday evening)
3-5: Transit to Hokodate (3 days?)
5-6: Hokodate (travel to Sapporo Thursday afternoon)
6-7: Sapporo (travel to Tokyo)
7-8: Transit to Tokyo (1 day?)
9-11: Tokyo (leave for Korea Monday evening)