Molokai is a much smaller island with a whole lot less going on, which may be exactly what you are looking for. On the north coast of Molokai, the Wailau Stream flows into the Pacific Ocean near Lapau Point. There is a black sand beach here that is formed from magnetite fragments washing down from a dormant volcano on East Molokai.
When leprosy was introduced to the Hawaiian Islands, Molokai is also where King Kamehameha V banished all afflicted to the isolated Kalaupapa peninsula. This is actually a very beautiful place and you can take a guided mule ride down the Kalaupapa trail. The trail is steep so it is not for everyone.