Loire/Normandie

Hi, My friend and I are joining a winery tour to Chablis and Burgundy the late August.  We are thinking to stop over to Paris for Friday-Sunday before we head up to Chablis.

In the Forum, I found that Normandie and Loire sounds interesting, are they public transportation accessible? Is train convenient?.  IS day trip doable?

Also, we know nothing about lodging, such as B&B, hotel.  Should we find some here close to train station? Any idea?

Winnie from Hong Kong