Hi Preet, if you like to travel to beaches then prefer going to Pondy or Gokarna. Both the places are amazing. Gokarna is mostly like a place where you go and do nothing and close to Gokarna there is Shimoga which is beautiful place. Pondy is one where you go take a beer sit at beach and mostly the cultural heritage is amazing. I can say both the places you can stay not more than 4 days. On the other hand Ooty and Coorg are hill stations. I don't know how Coorg is after the floods recently. But it's a beautiful place and so is Ooty. But these places are also for like 4 days one's.
There are other places like Wayanad, Hampi, Munnar, Kodaikanal, Mangalore etc., close by
In all the places you have mentioned there's nothing to see for 8-9 days.. try to make a combination of any two of them.. or do sightseeing along the way
2 options:
1st option-
1. Bangalore to Mysore (1 day/leave for next destination same evening)
2. Mysore to Coorg (2days)
3. Coorg to Mangalore (2 day)
4. Mangalore to Gokarna (2days)
5. Back to Bangalore.
2nd option-
1. Bangalore to Mysore (1 day)
2. Mysore to Ooty (2days)
3. Ooty & Conoor (3days)
4. Pondicherry (2days)
5. Back to Bangalore
So, this question is closed now. I went to Pondi and Ooty ( balancing my lust for beaches and love for mountains). I have even published a trip on it, hope you all like it :')