Kyoto's tofu (yudofu, agedashi tofu) is among Japan's best. Arashiyama has temple-side tofu restaurants worth the trip.
Shoraian (a wooden teahouse over the Hozu River) is a kaiseki-style tofu experience worth the splurge.
For budget tofu, try Tousuiro near Pontocho or Kyoto Yu-tofu Sagano in Arashiyama.