Temple 24, Hotsumisaki-ji, is the first of the pilgrimage temples in Kochi and is located at the tip of Cape Muroto.
It is one of the few temples that has historical rather than legendary links to Kobo Daishi, being located on the hilltop above the cave where he spent 3 years until achieving enlightenment. he founded the temple in 805.
It was here that he took the name Kukai. It is a Shingon temple and the honzon (main deity) is Kokuzo Bosatsu, the deity that Kukai chanted to a million times. It was reputedly carved by Kukai.
It is a very popular site for visitors, and there is a large lodgings facility for pilgrims, but when I stayed there in September I was the only guest.
In the grounds is a large boulder with indentations. Supposedly if the boulder is hit with rocks different musical tones are emitted. I didnt try it so I can't vouch for the veracity.