Start in the old town and follow the Historic Walk through the maze of streets using your tourist map. Most of the Dutch speak English, so don't worry about getting lost.
See Koninklijke Porceleyne Fles at Rottersdamweg 196, a porcelain factory. It is open to the public from 9:00 am to 5:00 pm from October to April and closed Sundays
Visit the Huis Lambert van Meerten Museum at Oulde Delft 199. It's open Tuesday through Saturday 10:00 am to 5:00 pm Tues through Saturday and Sundays 1:00 pm to 5:00 pm. This museum has a large collection of Delft and other tiles.
Start exploring by seeing the Nieuwe Kerk, open Monday through Friday with varying hours, so check ahead of time at the VVV.
Walk to Renaissance Stadhuis opposite the Niewe Kerk. You can climb the 370 steps of the tower for spectacular views.
Walk a bit west to Wynhaven, an old canal that leads to Hippolytusbuurt and the Gothic Oude Kerk, perhaps the town's finest building, with an unhealthily leaning tower.
Eat at Kobus Koch on Markt, a gem of a café/restaurant on the Beestenmarkt and sample the apple cake with cream.