Hi Kath,
I am in a cycling club in Winterthur (where my office is) where we do around 50-60 km on Wednesday evenings and ca. 100km on Saturdays with the occasional "serious" ride (140 - 220 km, 2500 - 5000 vm). In Zürich, Velo Elsener (
http://www.velo-elsener.ch/) in Seefeldstr. do tours at 18:30 on a Tuesday evening.
I often go for a ride on the weekends if you want to join in. I usually start in Kreis 6 where I live and go to Rapperswil and return via Forch & Pfannenstiel.
regards,
Philip