After World War II, he taught geography at Classical gymnasium (1945–1961) and then astronomy at Gimnasia Grammar School in Šentvid at Ljubljana (1961–1970).

Together with his older brother Jože, his youthful mentor, he was one of the pioneers of skiing, mountaineering and cave exploration in Slovenia.

After the war, he was among the founding members of the Slovenian Scout Organization and the Senior Patrol Leader of two - Dragon and Grey Wolf - troops.

Pavel Kunaver did not see any significant difference in pedagogical activities on the school premises or outdoors when on camping, trips or excursions.

He has previously campaigned in public against the use of Triglav and its surroundings as a ski tourist resort and against the use of the waters of Lake Bohinj, Kamnik Bistrica and Soca for hydroelectric power plants.

[3] As one of the pioneers of popular astronomy in Slovenia, he promoted astronomical knowledge, especially among the young, with a written and spoken word, also on the radio.

For pedagogical purposes he founded the first astronomical observatories in Slovenia, first at the civic school in Zgornja Šiška (1939) and after the war at the Montanistic Institute, at the gimnazija in Šubičeva ulica, on the roof of the Vega factory and at the gymnasium in Šentvid.

From 1939 onwards, he carried out regular astronomical observations of the Sun's activity for several decades and sent the data to the center in Zurich.

He also wrote eight popular books in astronomy and a number of articles in magazines like in Planinski vestnik and Proteus, in newspapers and in radio.