There are a huge number of onsens (both indoor and outdoor) to choose from. Here are a few interesting ones that can be reached in a day trip from Nagoya. If you go at a busy time (holiday season or weekend) you may need to book in advance.
One of Japan’s ‘top 3′ onsen towns
This town includes a unique river onsen. If you have the time and energy, you can dig a huge hole in the stony river bank and build your own personal onsen! The flow of natural hot water is totally free.
This old onsen is the only one in the world that is part of a world heritage site
Shirahama is a popular onsen town by the sea. Sakino Yu (above) has great views of the Pacific ocean.
Shirahama Footbath Street
Like onsens and drinking beer? Why not try both at the same time? It is a foot bath and bar combined- relax your feet in the hot water and enjoy a cold beer.
This popular onsen town is next to Mt Fuji. One of the more unusual onsen resorts in Hakone is Yunessun (entry 3500yen) which is basically the Disneyland of onsens. Here, men and women wear swimwear (unliked in normal onsens) and you can walk around the complex and try a host of unusual baths, including coffee (pictured), green tea, red wine, salt water from the dead sea, and many other options. There is also a footbath where small fish will bite your old skin away, waterslides, jacuzzis, saunas and a couple of swimming pools. Great fun! It takes about 150 minutes to reach Hakone Yumoto station from Nagoya.