Ooty, kodaikanal, etc in tamilnadu and trekking with nature in Kodachadri and humpi with culture in karnataka and wayanad in kerala so there are many spot in every state so you must choose a state to visit
From Mumbai you can start with visiting Gokarna, then enter Karnataka state. In Karnataka major city to visit is Bangalore whereby you can allot three full days. From Bangalore you can travel to Udupi, Coorg, Kudremukh and Chikmagalur. From there you can go still further down to Mysore and from Mysore enter Wayanad Kerala. Kerala has lots to explore. Starting from Trivandrum capital city, Cochin, Idukki, Thekkady, Ernakulam and Munnar. From Munnar Ooty is nearby so you enter Tamilnadu. Now you can travel to Kodaikanal, get down to Madurai cover Tiruchirappalli and Srirangam, further to Tirunelveli belt and via Kanyakumari enter chennai capital city. From Chennai getting travelling to Vizag is easy, whereby you could spend three days then by proceed towards Araku valley, Kurnool, Vijaywada, and finally stop by at Hyderabad where from there are trains, buses and flights to mumbai.
Wow Radhika!!I am super impressed from this girl❤️ thanks a lot .you literally made my planning super easy yaar...I am so excited and happy that I would hug you literally.I was so confused till now from where to start but this....this literally showed me the correct path.Thank u thank u so much 🙏