What to take to paris for the weekend?

If i am studying abroad in Paris for a month what are easy weekend trips to take to see Europe?

• I am planning on spending next January in Paris. An overnight to Antwerp is planned. I was also hoping to visit a friend in London for a couple days, and I'm sure that is easy enough. Where else can I/should I visit? We may also have a free week for traveling. Maybe italy? i'd love to go to spain but it may be too far and too difficult i know past students have done Amsterdam as well. I want to go to as many wonderful places as possible, but given the short time frame I don't want to try to hit all of Italy for example. Also, it will be January, so where is the weather going to be best? Thanks!

• Answer:

  Anywhere that can be reached by train will be fairly easy. Barcelona, Spain is certainly possible. Other places could be London, Nice, Amsterdam, Frankfurt, Milan. Also a short flight could take you pretty much anywhere in Europe.