Yeah, the dimension hits you indeed! You can also see some trucks and a white jeep parked at the rim. Its a 4WD trail, but poor/non-existing management is destroying that landscape. So I prefer no to drive there. Its not people's fault per say... poverty level with local Hawaiian is high, and this gives them easy money. But I still wish they manage the trail system though. Have one trail, rather than many random ones.
The walk is spectacular, and there are other patches of green sands before the beach proper. The second picture is one such patch. Smaller patches are better preserved naturally, as there are no people.
Altogether, amazing... I hadn't heard about green sand beaches before.
Yup , I saw the vehicles, and remembered you said it was quite a walk in... I wondered about that.