Can anyone please suggest must visit places in Karnataka?

if you have a taste for heritage and Archaeological sites, Humpi, Badami and Puttendkal will be a treat for you. I can vouch on that.

Well someplaces I think good for visiting are

1. Bangalore
2. Mysore
3. Humpi
4. Coorg
5.  Bandipur National Park
6. Chikmagalur
7. Shivanasamudra Falls
8. Udipi
9. Jog falls
10. Belur
11. Dandali
12. Gokarna

Some of the major attraction s are Belur Halebid temples , Shravanabelgola , Hampi and the many temples spread across the state. There are many waterfalls and river rafting facilities, beaches etc.