Spreeweg

On the way along the Spree you can cycle very well. Over the Moltke bridge you reach the main station. If you continue on the bank (Bettina-von-Armin-Ufer), you can drive back across the Luther Bridge on the other side of the Spree (Magnus-Hirschfeld-Ufer). This bike ride is great fun, on the Spree is always boat traffic and opportunities for breaks are available.

along the Spree through the government district, car-free and with beautiful views

all well and good, but why does the bike path end in nothing? It needs a working route network.