The Short Answer
A private custom walking tour with a local guide in Nagoya typically runs $186-227 flat for 1-4 people for a half day, since a single guide's fee doesn't change with a small group. A short specialty experience (bonsai workshop, koto lesson, calligraphy) runs cheaper and often per person from the first traveller — around $57-151 solo, roughly doubling per added person — since there's a genuine per-head material or instruction cost. A multi-day private journey (the 2-day Nakasendo and Kiso Valley trip) runs $1,440 flat for the group.
Nagoya Private Custom Tour with Local Guide (4 hours)
A real example of flat pricing for 1-4 people on a guided walking tour.
From $189
4 hours