Bydgoszcz's tap-and-go bike system is City Bikes and they've got the city well-covered!
There are 54 stations across the centre and new-comers are offered the first 20 minutes for free, though that is after a 10zł initiation fee. Enjoy beautififully-scenic bike paths through the Old Town, heading along the Brda River, out to Mill Island and further north to Myślęcinek Forest Park.