Day 5: UtrechtVisit the ancient and historic city of Utrecht. You can take a train from Groningen to Utrecht and it will take merely two hours to reach there. The city is a vibrant mix of modern concepts and historical buildings. Many of the historic city castles have been repurposed, now housing hotels, restaurants and shops. The areas along the wharfs are now the home of numerous cafés. You can easily explore Utrecht by foot or by renting a bike. You can either explore on your own or take a guided bike tour. Some of the attractions you can visit are Dom Tower, the Canals area, Railway Museum and Sint Willibrordkerk.