Watch Japanese snow monkeys soak in hot springs at Jigokudani Monkey Park in Nagano, and then immerse yourself at an ‘onsen.’ This day trip from Tokyo by bullet train starts with a guided tour of Zenko-ji, a 7th-century temple designated as a national treasure. Afterward spend an hour snapping photos of the bathing snow monkeys, and then unwind at Yudanaka Onsen where you have your choice of indoor and outdoor hot springs, saunas and foot baths. This seasonal day trip runs from January to April, and is limited to 15 people to ensure a small-group experience.