Cologne in a day?

Travel Info
I plan to do travel from Amsterdam to Cologne in second week of January. Just wanted to knw what places are there to see in a day at Cologne. The train arrives into Cologne at 10:30 and departs at 20:35 to Amsterdam. Is this time sufficient?

Travel Tips

K枚lner Dom has to been seen-Dreik枚nigsschrein or The Shrine of the Three Kings. It takes some time to see the church and get up to the roof.

Try a bakery (Apfelk眉chen-apple cake is my favorite) and get a sausage from a street vendor if this is your only stop in Germany.

Be sure to get a good look at the Rhine. K枚ln is on both sides of the river.

If there is a girl with you-Schokoladenmuseum (Chocolate Museum)
http://www.schokoladenmuseum.de/index_e....

Maybe get a bottle of 4711 if you need to bring back a gift.
http://www.4711.com/

Amsterdam is one of the best cities in Europe. Have fun there!