Quick guide for Kodaikanal bound tourists from MDU.
1) Exit from the station. Walk ahead. Take a right turn.
2) Walk to the traffic signal to reach Periyar bus-stand.
3) Take a local bus to Arapalayam bus stand. Bus#48 is one of them. It'd take 15 minutes and Rs.9/- in the bus.
4)...
more... From Arapalayam bus stand, take the bus to Kodaikanal, it'd take 3.5-4 hrs and Rs. 62/- for the journey.
5) In return, the last direct bus to MDU from Kodaikanal is at around 17:15. So DO NOT plan a departure later than that.
6) In case you get late, you can get a Dindigul bound bus to Batlagundu (from where you can change for MDU) but even that service isn't available after 19:30.