Reach Hubli by any travel bus and hire a vehicle to gokarna. Travel time is 4hrs from Hubli to gokarna.
Reach Belakan beach and start beach trail to OM beach. You should follow paradise beach trail.
The trail will go through middle of forest and sometimes on the beach side. You will just walk on side paths of beach.
First beach we see will be paradise beach. Stop on the sunset point in the middle of trek, you can see it's the highest point.