Rent a canoe or kayak. Either take a tour through the city, make sure to visit the Minstroom and Oudegracht. Or take a tour outside the city on the Kromme Rijn towards Bunnik, and dock at Theehuis Rhijnauwen to eat pancakes.
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Rietveld Schröder House
The house, designed by Gerrit Rietveld, was built in 1923-1924 in Utrecht. The structure of the house is completely in line with the ideas of the art movement De Stijl (The Style). The house was designed and built for Truus Schröder-Schräder, who lived there from 1924 till her death in 1985. It can only be visited under supervision of a tour guide. In 2000 the house was placed on the UNESCO World Heritage List.
campus of the Utrecht University
It is a rather strange mix between grey concrete buildings and buildings here that are designed by famous modern architects, like the Educatorium designed by Rem Koolhaas, the University Library and the Minnaert building. There is also a beautiful botanical garden that is 8 acres big, houses 6 thousand different sorts of plants and a Napoleonic fort. Also worth a look: the bicycle track at the Heidelberglaan which is broad enough to function as a two-way car-track. The university campus can be reached from the Central Station by taking tram Line 20, 21, or 22.
Netherlands Railway Museum
The museum is housed on the site of Utrecht Maliebaan station, the former terminus of the first railway line between the city and Amsterdam, and incorporates the original station building with modern additions. It reopened in June 2005 after an intensive renovation. Static displays of trains, with some more "theme park" attractions such as the dark ride "Steel Monsters" and the not-too-serious train simulator "Trial By Fire".
Botanical Garden
The oldest municipal museum in the Netherlands. It has a large art collection including the world’s largest collection of Rietveld designs and a permanent exhibition on Dick Bruna. There are usually several temporary exhibitions, an overview of which you can find at their site.
The museum of the Utrecht University.