I have read about the train trip from Nice to the foothills of the Alps. It apparently is the "La Route Napoleon". I know the train leaves from the Gare de Sur and not the main station but I do not know the proper town to plug in the train destination. I want to do the trip in one day - round trip, and ideally would like to have a destination town that I could explore before the return trip. Any suggestions/information would be appreciated.