If you can drive the Hana Highway on a fat joint of elephant weed and back.. Yur OK. And lucky.
I have never taken that route personally. :-)
I drove it about a year ago now... My wife needed a valium or a big fat joint just riding in the back seat, I can tell you that, she is NOT a good passenger on a curvy road with cliffs off one side and all those one lane bridges were almost her breaking point!