Bus / train from chennai Central to pondicherry..?

Hi everyone! I’m planning a one-day trip to Pondicherry from Chennai with my parents. We’ll be starting from Chennai Central in the morning and returning the same night, but I have no idea about where to catch buses or trains, what time they usually run, or what the best route would be. I’d really appreciate guidance on the easiest and most comfortable way to travel, including morning departure options and reliable evening return options. Also, since I’ll be traveling with my parents, I’m looking for peaceful, less crowded, and not-too-fancy places to visit in Pondicherry—like calm beaches, heritage spots, or quiet areas to just relax. Suggestions for good, simple cafés or restaurants with nice food and a relaxed atmosphere would also be very helpful. Thanks in advance!