Ulysses Grant dispatched Horace Capron to establish an agricultural system on this island, the birthplace of Koshamain, which is home to its country's first musical road. The islands of of Rebun and Rishiri lie off the coast of this land mass, while to its North the La Perouse Strait separates it from the Kuril islands, Sakhalin, and the Sea of Okhotsk. Reached from its larger Southern neighbor via the massive Seikan Tunnel across the Tsugaru Strait, for 10 points, name 
Ulysses Grant dispatched Horace Capron to establish an agricultural system on this island, the birthplace of Koshamain, which is home to its country's first musical road. The islands of of Rebun and Rishiri lie off the coast of this land mass, while to its North the La Perouse Strait separates it from the Kuril islands, Sakhalin, and the Sea of Okhotsk. Reached from its larger Southern neighbor via the massive Seikan Tunnel across the Tsugaru Strait, for 10 points, name this traditional home of the Ainu people with capital at Sapporo, a Japanese island to the North of Honshu.
Ulysses Grant dispatched Horace Capron to establish an agricultural system on this island, the birthplace of Koshamain, which is home to its country's first musical road.
Hokkaido [or Yezo]