It sucks until you're close to müggelsee in Köpenick. Then you have the nice stuff in the woods there, you go dangerously close to the Tesla plant, then loop around meandering spree, at 50k there's a great spot with a bridge over the spree (it's also a place where you are allowed to "wild" camp). Back with maybe a stop at cyclist famous Holly's Kuchen, Sportpromenade along Krumme Lanke Lake (best water in my opinion) to get spit out from Ostkrone, the cycle track along the canal, in Neuköllns famous Hochdecksiedlung.
This is my go to 100k:
https://www.komoot.de/tour/177525319?ref=aso&share_token=aEPXQp3QnPwKUzyMdHFF3on75HY4Tn1AoZ6MdadxRXSpVqPdn0
It sucks until you're close to müggelsee in Köpenick. Then you have the nice stuff in the woods there, you go dangerously close to the Tesla plant, then loop around meandering spree, at 50k there's a great spot with a bridge over the spree (it's also a place where you are allowed to "wild" camp). Back with maybe a stop at cyclist famous Holly's Kuchen, Sportpromenade along Krumme Lanke Lake (best water in my opinion) to get spit out from Ostkrone, the cycle track along the canal, in Neuköllns famous Hochdecksiedlung.