Question: Kalalau Beach is a beach on the Nā Pali Coast at the base of the Kalalau Valley in north-west Kauaʻ i in Hawaii, it is the final destination of which  trail along Nā Pali Coast of the island of Kauai in the state of Hawaii?

Context paragraphs:
Kalalau Beach: Kalalau Beach is a beach on the Nā Pali Coast at the base of the Kalalau Valley in north-west Kauaʻ i in Hawaiʻ i.  It is the final destination of the Kalalau Trail, one of the most difficult trails on the Hawaiian Islands.  The beach is approximately 1 mile long, with trails snaking through the rest of the valley where people in hiding are rumored to live.  There is a camp site on the beach, with a waterfall providing fresh water and composting toilets available.  Camping requires a permit.  All trash must be packed out.  The beach is beautiful and secluded.

Euphorbia eleanoriae: Euphorbia eleanoriae is a rare species of flowering plant in the euphorb family known by the common name Nā Pali sandmat.  It is endemic to Kauaʻ i, Hawaii.  Like other native Hawaiian euphorbs it is called ʻ akoko locally.  This plant was only discovered in 1992 and described to science in 1996 as "Chamaesyce eleanoriae".  At that time there were fewer than 500 plants known, all occurring in small populations scattered across the sheer cliffs along the Nā Pali Coast of Kauaʻ i. By 2001 the total population had already dropped; only three populations were found, for a total of fewer than 50 plants.  The plant was federally listed as an endangered species of the United States in 2010.

Kalalau Trail: The Kalalau Trail is a trail along Nā Pali Coast of the island of Kauai in the state of Hawaii.  The trail runs approximately 11 mi along the island's north shore from Keʻ e Beach to the Kalalau Valley.  The trail has been named one of the most beautiful, and dangerous, hikes in the world.

Kadua st-johnii: Kadua st-johnii (formerly "Hedyotis st-johnii") is a rare species of flowering plant in the coffee family known by the common name Nā Pali beach starviolet.  It is endemic to Hawaii, where it is known only from the Nā Pali coast of Kauai.  It is a federally listed endangered species of the United States.

Hanakoa Valley: Hanakoa Valley is a hanging valley along the Kalalau Trail along the Nā Pali Coast of the island of Kauai in the state of Hawaii.  Hanakoa has primitive camping via permit only.  It is located on mile 6 of the Kalalau Trail, often used as a resting destination for hikers completing the Kalalau Trail to Kalalau Valley.  Nearby Hanakoa Falls is accessible by an unmaintained trail.

Nā Pali Coast State Park: The Nā Pali Coast State Park is a 6175 acre Hawaiian state park located in the center of the rugged 16 mi along the northwest side of Kauaʻ i, the oldest inhabited Hawaiian island.  The Nā Pali coast itself extends southwest starting at Keʻ e Beach extending all the way to Polihale State Park.  The "na pali" (high cliffs) along the shoreline rise as much as 4000 ft above the Pacific Ocean.  The state park was formed to protect the Kalalau Valley.

Hanakapiai Beach: Hanakāpīʻai Beach is a beach in the Hawaiian islands located on Kauai's Nā Pali Coast.  The beach is approximately 2 mi from the start of the Kalalau Trail, a very popular hiking trail which is located at Keʻe Beach.  It is also about 2 miles from Hanakapiai Falls.  During summer months, Hanakāpīʻai Beach's sandy shore line is clearly visible; during winter months, dangerously powerful waves and high tides wash away the sandy shore line.  The beach is remotely located with no road access.  The word "Hanakāpīʻai" literally means "bay sprinkling food" in Hawaiian.

Kalalau Valley: The Kalalau Valley is located on the northwest side of the island of Kauaʻ i in the state of Hawaiʻ i.  The valley is located in the Nā Pali Coast State Park and houses the Kalalau Beach.  The Nā Pali Coast is rugged and is inaccessible to automobiles.  The only legal ways to access the valley are by kayak or by hiking the Kalalau Trail.

Honopū Valley: Honopū Valley is a landmark valley within Nā Pali Coast State Park along the northwest shore of Kauaʻ i, Hawaiʻ i.  It is known for its distinctive natural arch, which at approximately 90 ft tall is the tallest in Hawaii.  At the lower end of the valley is Honopū's secluded, 0.25 mi beach, also known as Cathedral Beach.

Charpentiera densiflora: Charpentiera densiflora is a rare species of tree in the amaranth family known by the common names dense-flowered pāpala and Nā Pali Coast pāpala.  It is endemic to the island of Kauai in Hawaii, where there are 300 to 400 mature trees remaining.  This and many other rare Kauaian plants were added to the endangered species list of the United States in 2010.

Supporting paragraphs: Kalalau Beach Kalalau Trail
Answer: Kalalau Trail