The jeep trail is a mud track, and as can be guessed, dust from the ongoing ( and incoming ) jeeps will trouble you for a bit. Half an hour of your walk will lead you to the famous Mookambika temple, which is where the jeep trail ends. You can have your lunch here ( we had got our stuff packed from the home stay, which seems quite a good option to me, considering the rudimentary nature of arrangements on the route and at the temple ).
It's a brief walk up from the temple and till the Kodachadri peak now. It will still take you close to an hour I'm sure, as the climb becomes steep at intervals. Once at the peak and near it, you will enjoy magnificent views of the scenery around you, while a small temple ( dedicated to Adi Shankara ) at the top will pique your curiosity.
Now, depending on the time at hand, you can either wait for the sunset ( we did not ! ) and explore the environs around, or head back to reach down before the same. This a place of historical/mythological importance, and there are some sites keeping in tune with the same. Your Wikipedia print-out should be sufficient for you to ask around I guess. There are plenty of people to help you out here, as this place is quite sacred for the Keralites. Whole families turn up, and that is because the jeep trail exists, and it is pretty busy in fact.
The trek route for the families is a bit different. It starts at the temple where the jeep trail ends, and meets up somewhere with the other trek route which we took. We decided to go back via the 'family' route as it was supposed to be a bit easy on our knees; now that we had completed the first, and better half of the trek !
Once at the temple, you have the option to walk down the jeep trail ( The trek route through which we came in is rightly deemed to get quite difficult once the sun goes down ), or hitch a ride on one of the jeeps. We decided to go with the former option, as we had come here to trek anyway. But at the end of it, I realized that it was not worth it, as the dust from the jeep traffic troubles you quite a bit. A trek, as far as I want it, should take us through pristine jungle routes, and not subject us to the very issues that we leave our cities for ( read, dust and pollution ).
So, for me, I'd definitely recommend you to take one of the jeeps back from the temple. These jeeps will get you all the way to the trek starting point, and from there you can walk back the last half mile to the home stay.