There are a number of day hikes, short and long, out of uber popular Waiʻanapanapa State Park.
The park includes … seabird colonies, anchialine pools, native hala (Pandanus tectorius) forest, caves, heiau (religious temple), a natural arch, sea stacks, blowholes and a small black sand beach….
You can walk to Hana (3mi) along the coast, if you like. I walked most of that, often closer to the water than the official trail. Some call this the WAI’ANAPANAPA COASTAL TRAIL.
A few pics:
Close to the parking lot, the most popular attraction is this black sand beach.
All very pretty. Especially the contrasting bright green vegetation against dark black lava stone.
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