If you are from bangalore then yelagiri is not much of a difference. Now if you want a drive to cruise at around 160Km on weekend then I would recommend Yelagiri.
We planned to Yelagiri for a weekend, thanks to amazing TN roads it really a cruise, if you are leaving from bangalore make sure you leave early have a great breakfast at A2B on the high ways & then move along to vaniyambadi then to yelagiri.
There are people coming from bangalore & chennai so the place will be a busybee during weekends & the tariff will be max on these days.
Things you can plan for :
1) Nature lovers : Just jump into the forest around the hills look for the birds or take a book to relax.
2) Go boating, ..
3) Jump into Nature park, relax on the gardens.. Skip the fountain show its pathetic
4) There is a ayurvedic massage center just after the nature park u can spend your time there too !
5) Options for paragliding are available , but I never actively notice it .
6) If you go by two wheeler or car just drive around its nice in the evening.