Following a river cruise, we will be in Marseilles and traveling from there to Cassis in Provence. What is the best way for us to get there?
There are frequent, direct trains between the main train stations. From the Cassis train station, take a taxi two miles to most hotels, or local buses run into town about hourly.
How to Look Up Train Schedules and Routes Online gives you the DB train schedule link and tips for using it, or the French source is http://www.sncf.com/en/passengers. Buy the ticket in the station for €5.30.
Frequent trains, takes only 23 minutes.