Should I bring trekking poles to Arashiyama in Kyoto?

No need

Arashiyama is actually very low, and most of the scenic spots are in mountain valleys. There are only a few temples on the hillside. Most of the mountainous areas are private land and unauthorized entry is not allowed.

Arashiyama can be appreciated with your eyes. You can take a sightseeing train, an observation boat, a rickshaw, or take a walk.

See the map for major attractions (the large green area on the lower left is Arashiyama):