is amazing and a highlight for me. Enter just before the bend in the road before the eucalyptus rainbow trees. You might need to park closer to the eucalyptus rainbow trees area and backtrack 150-200 yards to the hole-in-the-roadside entrance.
There is a little cove in the NW part of the island near the Kapalua Tidepools that is magical for swimming and snorkeling.
I was blown away by our hike in the Ioa Valley.