Walking - the centre is small enough to walk across in ten minutes. The streets in the city centre are pedestrianized. Make sure you leave room for traffic on push-bikes. The locals are zooming around going about on their daily business. Even though locals are usually aware of tourists looking up at the gables and are ready for unsuspended side steps. Try to keep an eye on the traffic. A collision with a bike can ruin your whole day.
At the train station you can rent push bikes. Make sure you understand the traffic rules before you set off. Cyclist are expected to ride their bikes in an assertive way. If you have a wobbely and uncertain trajectory, cars tend to overtake. This would make the cycling experience even more harrowing. Realise that even if you have right of way, a car is still a lot harder then you. Most locals will mount the pavement shortly to let cars past on the canals where possible. This is just curtious because the next time when you are driving the car you hope to be let thrue as well.
Walking around without a top is considered uncouth.
The municipal tourist information point on the Hippolytusbuurt 4 can provide you with up to date information about upcoming activities and festivals. Their English website is good. (http://delft.nl/webEN/)
