If you want to do day trips, I recommend you the Region of Champagne, mainly Epernay. I just came back from there & I visited the Eugene Mercier Champagne House, the cellars are impresive & the guided visit was amazing. There are english tours, but they open at 9:00 AM & close at 11:30 & they open again from 2 to 4:30 PM. THe English tour is at 2:00 PM. Also I have never seen this Champagne in Canada. If you take a day trip it will take about 45 minutes from Paris in the TGV, to Reims, there might be trains that take you directly to Epernay. I stayed in Reims that is a bigger city, Epernay is smaller, I wished I stayed there.
If you decide to go to Mercier Champagne, if you are a little bit early, 1 block before arriving to Mercier you can kill time in a small Restaurant Bar call Le Chinois, & you can taste Champagne ahead of time, I recommend you to sit in the Bar so you chat with locals, people were so friendly, even my husband said as he does not speak a word of French.
Regarding the Alsace region, I was in Stratsbourg for the day it is so nice I find out that one day is not enough, specially if you want to visit small towns near the area & small wineries. The TGV will take approximately 2 hours from Paris.
Hope this helps. If you need more help please feel free to add another post.
Mrs. Pilar Harrietha
Toronto ON CANADA