You can find the best things to do in Gokarna in the many travelogues of real travellers. Read them here: goo.gl/oX7pQV . Check out all accommodation options here: goo.gl/DUFrQj
Best places to visit in Gokarna are
Om Beach, Mahabaleshwar Temple,
Kudle beach.
Try Gokarna temple accomodation for cheaper accomodation or else u can goto Kudle Beach resort.
You can also visit Idugunji, Murudeshwar and Kolluru
Or Shirley Falls, Vibhuti Falls, Sathodi Falls, Maagodu Falls.
I hope you have made your trip. It would be helpful for travellers if you share the travel details:
1.Route
2.Transportation
3.Weather
4.Budget
5.Places to see
6.Tips for travellers etc.
Happy travelling.