Day 1 – Take the Shinkansen from Tokyo to Sendai (about two hours) and then board a sightseeing boat for a 50-minute trip to Matsushima, famous for its scenic coastline of pine-studded islets. Visit the venerable Zuiganji Temple, northern Japan's most famous Zen temple, Entsuin Temple with its nice gardens, and a museum or two. Spend the night in Matsushima.
Day 2 – Return to Sendai and take the Shinkansen onward to Kakunodate, a small and relatively unspoiled castle town famous for its samurai district and cherry trees. Be sure to see the Aoyagi Samurai Manor, a compound of traditional buildings packed with Edo-Period memorabilia. Spend the night in Kakunodate.
Days 3-4 – Backtrack one stop on the Shinkansen to Tazawako and board a bus for Nyuto Onsen, a secluded valley of hot springs and rustic inns. It's a good base from which to explore the many wonders of the Towada-Hachimantai National Park, including hiking, skiing, and swimming.