Hello! That's a great choice of destinations. They each have their unique charm and I'm sure you'll have an incredible time exploring them. Here are some travel tips to keep in mind.

Best Time to Visit:
The ideal time to visit Coimbatore, Ooty, Kodaikanal and Bangalore would be between October to February, during the winter. The weather is pleasant and it's a perfect time for sightseeing and other activities.

Route and Accessibility:
You can reach Coimbatore by flight, bus or train from major cities. From Coimbatore, you can hire a cab or take a bus to Ooty and Kodaikanal. Finally, you can reach Bangalore via bus or train from Kodaikanal.

Accommodation and Booking:
There are a variety of accommodations available in each of these cities, ranging from luxury hotels to budget guest houses. Online platforms like Booking.com, Airbnb and MakeMyTrip can be used for booking. Booking in advance is recommended during peak season.

Clothing and Essentials:
Given the temperatures in these cities can vary, it would be advisable to carry a mix of light and warm clothing. Also, don't forget essential items like sunglasses, sunscreens, and a good pair of walking shoes. Also, if you're planning to visit any wildlife sanctuaries, you would need clothes in muted colors.

Health and Safety:
These places are generally safe for travel. However, it's advisable to secure your belongings and avoid isolated places at night. Keeping a personal medical kit for emergencies is also recommended.

Local Etiquette and Respect:
Given these places are all in the southern part of India, the local populace appreciates it when visitors respect their customs and rituals. It's appropriate to dress modestly in temples and other religious places.