Valenbisi is one of the best public transports in the city. You can grab public bikes from one of many bike stations around the city, use it for 30 minutes, and then drop it off at another station. There are dedicated bike lanes throughout the city.
Annual Pass: €29.21 (€0.52 for 2nd 30 minutes)
7 Day Pass: €13.30 (€1.04 for 2nd 30 minutes)
You can sign up for a 7 day pass at the station and the annual pass online.
Note: The bike station interface takes a little bit of time to get used to.