Know Before You Go
It's a short drive south from Dubrovnik or if you don't have a car, take the public bus heading south on 8 and tell the driver that you’d like to exit at the bus stop in Kupari. Once you get off the bus, you’ll be on the right hand side of the road facing south. Make a u-turn and walk north until you see the first little road on your left. The first portion of the road is paved and then it turns to dirt. Follow it until you reach the sea and you've arrived.
Bring a flashlight if you really want to explore. Some of the stairways are in the back where there isn't much natural light. There's lots of broken glass and debris so be careful of your feet.