Buy the singletrail map for Einseideln Rigi, there are some good trails marked in it, and once you find these you will find many more in the vacinity of them. I know there are some trails on the Zugerberg there is a tour in the Mountain bike Erlebnis book for Zentral Schweiz on Zugerberg which brings you close to some of these trails. There are also some more trails closer to Aegeri by Gotschalkenberg, Biberbrugg and around Rige itself.

You are nearly always going to find hikers as well on most of the singletrails, its a fact of life, just be nice to them, so they don't get us kicked off the trails permanently! If you want hiker free trails then go to Filzbach or Gurten and get the lift up to ride the freeride routes down.

There are plenty of trails around, buy the maps and go searching!