I'm in Berlin tonight, and one of the things I'm most looking forward to is my morning run along the River Spree, past the Chancellors Residence, around near the Reichstag and then back past the Central station for a well-earned breakfast in the hotel.
It'll only be about 4K, but I'll feel like part of the running community as I will be overtaken by many fit, young gazelles along the river. Normally I'm on my own.
Running tourism is the best! (Pictures are from last time I was there).