I'll be in Chennai on business for three weeks in early August (the date isn't fixed as yet). I'd like to get an idea of some things to do. On weekdays I'll have the afternoons free; I'll have two weekends to do more extensive trips. I'm planning on making the most of this trip. What things should I consider? I really enjoy hiking and if I can do that it'd be great. I'm a fairly experienced backpack traveler (Europe, Korea, and Japan, as well as all over the US) and I don't mind roughing it.