I just moved to Rotterdam for school and decided to play tourist by joining a Bike and Bite tour. The "Off the Eaten Track" tour with Rodger was fabulous! I didn't want it to end! Rodger was an awesome guide. He knows Rotterdam inside and out -- you can quite honestly ask him anything. This tour is also the perfect opportunity to explore parts of the city that you might never venture into otherwise (especially if you're just visiting for a few days). It really gives more context and shape to a colourful city with a fascinating history.
Oh, and bonus... learned about Dutch bicycle protocol/etiquette by default. Good food, good beer, good people, and good times pedalling along with the wind blowing through your hair. Highly recommended!More