It was a 45 minute commuter flight from Amsterdam to Bremen, then I took a streetcar from the airport to the main train station where I bought a train ticket and literally jumped on the train to Oldenburg. What a pleasant 30 minute experience seeing the countryside in Northern Germany and people watching.  The Germans love their trains and it was filled with bicycles and people of all ages who were practically hanging out the windows it was so crowded.  It was a gorgeous day as you can tell from the t-shirts and there was not a cloud in the sky.  My hotel was a 10 minute walk from the Oldenburg Train Station.