Muni trails around Heidelberg?

I am going on vacation to Heidelberg next week. Any recommendations on muni trails in that area?

havent tried it but seems nice:

If you want to ride on this track you have to get a “visitor-pass”.
You can get it from Rainer at his bikeshop:

Cause its a “club-rider only” track. With the visitor-pass, you’ll get a 1-day-membership.