You may rent a car and go there yourself - the stone forest is 18 km from Varna.
You can get the exact driving route by going to http://maps.google.com. Click Get Directions and write as directions:
from: varna, bulgaria
to: Pobiti Kamani, The Magic Circle, The Stone Forest, Bulgaria
Alternatively, you may ask at your hotel for local guides who may drive you there and speak english..
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