Burrah(Borra) caves are very special in nature and every one will love it. There you will find very nice natural designs of rock. From vishakapatnam it is around 100 km. Better you plan by train for onward journey and make sure you find a window seat at left side which is useful for seeing the mountains and slopes very well. You will experience the lovely nature in this train route and in between your journey you will find some bridges the train passes through, then the people start shouting with joy.
Finally you will reach Borra caves station from there you should hire some private vehicles to borra caves and even there were many places to visit like Katiki water falls (you can play under the falls but you have to walk 1km in forest and make sure to travel in group and near to the falls you have to walk on the edge like way be careful) , Araku valley, Tribal museum, coffee estate (nice spot to have a sip of coffee in the beautiful nature definitely you will love it).