Mike Dalley
Google
Doesn't look like much on the outside, but this small and tranquil temple, built by a wife in tribute to her husband, is a good excursion for an hour or so. Admission is ¥550 but can be bought in a bundle with the Kodaji Temple and Sho Museum access.
The temple building is beautiful, with orantely decorated rooms and artefacts on display. You remove your shoes and carry them through in a bag (provided) as you explore.
Addionally, there's a Buddihist zen garden and a few ways to get interactive, such as collecting stamps, tracing a prayer for yourself, and making your own zen garden (the latter has a fee). It's a cute little surprise and a welcome retreat from the nearby crowds and has a lovely tea house where you can sit and chill for a short while.