family 

woodworking  and Canoeing (self-made canoe...)

scuba-diving

bee-keeping

Astronomy (check out the website of the Astroclub Solaris Aarau, ASA !)

Bats, Chiroptera, Fledermäuse, murcielagos, pipistrelli, fu, chauve souris, lederlap, ... in short "Flädis"