Favorite thing: Just past the corner of the HEMA department store, you now see the oldest building in the city, the Schielandshuis. Named after the Dike Board of Schieland, which moved into the premises in 1665, the Schielandhuis was built in Dutch classic style with baroque details. When Napoleion visited Rotterdam in 1811, he stayed here. The Schielandshuis was painstakingly restored between 1981 and 1985, and now houses the Rotterdam History Museum.
NAI is an architectural museum near the Euromast. It has an interesting design and it's worth visiting. During the year there are always interesting international expositions.
The museum is reachable by metro; get of at Eendrachtsplein OR Dijkzigt or take tram 4 OR 5.
More information: www.nai.nl