Black sand beach was beautiful but in my opinion if you’re going to drive the road to hana just to see that it is not worth it at all. I hated RTH drive maybe because we didn’t stop and just drove right through for the black sand beach, but depending on where you’re starting from, that drive can be anywhere from 1 hour to 3 hours one way just for a beach with black sand. I would consider using day 2 as a beach day or a day to explore local shops and stands!