Hi Meghna,
You can visit the below mentioned places:
- Chikmagalur
- Alleppey
- Puducherry
- Rameshwaram
- Nandi Hills
- Thanjavur
- Coonoor
- Kolli Hills, etc.
Head to Kerala in July. During monsoon, most of the waterfalls get live and stunning. Kerala becomes all together a different place during Monsoon. Hope it helps.