I run playgroups & a Baby Cafe just outside the city of Zurich. It is not in Hoengg, but I do have existing members who come from Hoenng & Zurich city and they assure me (& this is evidenced by their continued presence) it is worth the journey. I have watched as many people form networks and make new friends at my playgroups and meetings. Please PM me if you wish to know the location & view the webpage.
The Swiss section of Anglo Info also has a good list of playgroups in and around Zurich.
There are also non-profit meet up groups at
www.meetup.com - called "Zurich Moms" and "Zurich and Baden Moms" and one on the Meilen side "Apple Tree customer meet up group".
Once you know the right networks, it really is easy to meet new people and enjoy playdates and getting outdoors with the children here. Good luck.