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If you have not visited, you could check out puliyancholai falls in kolli hills. heard it is a nice place. there are other falls too in the same kolli hills.
you could visit the temples in the surrounding (so many of them) and mukkombu too.
yelagiri has many places that can be explored. If you are going as a group and all are young and active you could try tada. waterfalls. you need to trek. now you can stay in tada in huts. (if you are adventurous and can plan )