Try zostel there and some places like Kodaikanal Lake, Silver Cascade Falls, Bryant Park are must visiting places.
For stay i would suggest home stays or Zostel. As its summer time there will be hardly any water in waterfalls. kodaikanal lake is one of the best places to spend time and in earlly morning you can go for trekking to Perumal Peak. Guan cave also you can visit
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Places to visit in Kodaikanal: Kodaikanal Lake Silver Cascade Falls Bear Shola Falls Coakers Walk Thalaiyar Falls Vattakanal Falls