Choose anchors, not a checklist
Start with Marina Beach and build outward only if the day still has room.
- Anchor the day around Marina Beach or Kapaleeshwarar Temple.
- Keep San Thome Basilica for the right weather and timing.
The strongest attractions plan in Chennai is selective. I would make Marina Beach the first anchor, add Kapaleeshwarar Temple or Fort St. George if they sit naturally nearby, and save San Thome Basilica for the right timing instead of forcing it.
The practical rule is simple: Kapaleeshwarar Temple or Government Museum first, food and shopping in the middle, Marina Beach near sunset. That keeps the day grounded instead of making it feel like a loose checklist.