Almost all volcanoes occupy the southern part of Kamchatka. Not many people go to the northen part (Koryak Autonomous Region), because there are no high mountains there and flights there are pretty expensive. This maps shows just areas visited by me plus Kluchevsky volcano.

From Kozyrevsk village over Tolbachik volcano and Tumroks hot springs to Lazo village

Mutnovsky and Gorely volcanos