Many people often buy a one-way ticket and return a different way: you can take a Hozugawa River Cruise
back down to Arashiyama (a bus connects the station and the cruise's dock). You can also use your JR Pass
for the return trip; the Kameoka Torokko terminus station is a short walk from Umahori JR Station, and trains from here run to Arashiyama, Nijo Station (a ten minute walk from Nijo Castle), and Kyoto Station.
For details and train hours, visit the website