Question: Which coast does this trail run along which provides a hiking passage to Kalalau Valley?

full_context: Document 1: Mokolea Rock: Mōkōlea Rock is an islet in Kailua Bay along the windward coast of Oʻ ahu in Hawaiʻ i and located east of Marine Corps Base Hawaii (MCBH). Like most of the small islets off the coastline of a major island in the Hawaiian Islands, Mōkōlea is a State Bird Sanctuary containing many types of birds. Access to the islet requires a permit, and is only allowed to people involved in protecting the islet's fauna. The islet is more commonly known to local residents as "Birdshit Island", "Birdshit", or simply "Bird" because its black lava rock surface is heavily coated with bird droppings.
Document 2: Kualoa Ranch: Kualoa is a 4000-acre private nature reserve and working cattle ranch, as well as a popular tourist attraction and filming location on the windward coast of Oahu in Hawaii. It is located about 24 miles from Honolulu, and 32 miles from Haleiwa. The ranch consists of 3 valleys: Kaaawa Valley, Kualoa Valley, and Hakipuu Valley. The ranch is located on Hawaii State Route 83 between Kaaawa and Waikane, . The main street address is 49-560 Kamehameha Highway, Kaneohe, Hawaii 96744.
Document 3: Hawaii Kai, Hawaii: Hawaiʻ i Kai is a largely residential area located in the City & County of Honolulu, in the East Honolulu CDP on the island of Oʻ ahu. Hawaiʻ i Kai is the largest of several communities at the eastern end of the island. The area was largely developed by Henry J. Kaiser around the ancient Maunalua fishpond and wetlands area known as Kuapā (meaning "fishpond wall"). The Hawaiʻ i Kai or Koko Marina was dredged from Kuapā Pond starting around 1959. Dredging not only transformed the shallow coastal inlet and wetlands into a marine embayment, but was accompanied by considerable filling and clearing of the pond margins. In 1961, Kaiser-Aetna entered into a lease agreement with the land owner, the Bernice Pauahi Bishop Estate, to develop the 521 acre (2.11 km²) fishpond into residential tracts with a marina and channels separated by fingers of land and islands upon which house lots and commercial properties would be laid out and developed (ACOE, 1975). Nearly all of the low-lying lands surrounding the marina have since been developed, and neighborhoods now extend back into the several valleys and up the separating ridges.
Document 4: Kohala, Hawaii: Kohala is the name of the northwest portion of the island of Hawaiʻ i in the Hawaiian Archipelago. In ancient Hawaii it was often ruled by an independent High Chief called the "Aliʻ i Nui". In modern times it is divided into two districts of Hawaii County: North Kohala and South Kohala. Locals commonly use the name Kohala to refer to the census-designated places of Halaʻ ula, Hāwī, and Kapaʻ au collectively. The dry western shore is commonly known as the Kohala Coast, which has golf courses and seaside resorts.
Document 5: 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.
Document 6: Devastation Trail: Devastation Trail is a trail at Hawaiʻi Volcanoes National Park. The paved trail allows visitors to explore the site of 1959 eruption of Kīlauea Iki crater.
Document 7: Port Allen, Hawaii: Port Allen is a populated place at Hanapepe Bay, 20 nautical miles from Nawiliwili, in Kauai County, in the U.S. state of Hawaii. Originally named ʻ Eleʻ ele Landing, terminal owner Kauai Railway renamed it for Honolulu business man and port financial backer Samuel Clesson Allen. When the Civilian Conservation Corps Camp in Koke'e State Park was built in 1935, the lumber for the camp was floated ashore at Port Allen. Captain James Cook landed on Kauai in this area. The facilities were demolished in 1982 by Hurricane Iwa, but eventually rebuilt.
Document 8: Puʻu Kukui: Puʻ u Kukui is a mountain peak in Hawaiʻ i. It is the highest peak of Mauna Kahalawai (the West Maui Mountains). The 1764 m summit rises above the Puʻ u Kukui Watershed Management Area, an 8661 acre private nature preserve maintained by the Maui Land & Pineapple Company. The peak was formed by a volcano whose caldera eroded into what is now Īʻ ao Valley.
Document 9: Kilauea Military Camp: Kīlauea Military Camp (KMC) is operated as a Morale, Welfare and Recreation (MWR) facility on Hawai‘i Island, also known as the Big Island, in Hawaiʻi. It is located inside Hawaiʻi Volcanoes National Park. This U.S. Department of Defense (DOD) facility is at an elevation of 4000 feet, within walking distance from Kilauea Volcano, the world’s most active volcano.
Document 10: Sandy Beach, Hawaii: Sandy Beach (location ) is a beach on the South Shore of Oʻ ahu in Hawaiʻ i. It is known for its excellent bodyboarding and bodysurfing opportunities due to shore break that breaks very close to the shore, and consistent barrels all along the beach. Consequently, more injuries occur per year at Sandy Beach than any other beach in Hawaiʻ i, earning it the infamous nickname, "break-neck" beach. The water is especially dangerous during high surf, when strong rip currents are present. The beach park is located between Hanauma Bay Nature Preserve Park on the west and Makapuʻ u Point on east along 8800 Kalanianaʻ ole Highway in Hawaiʻ i Kai, on Honolulu's southside neighborhood.
Document 11: 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.
Document 12: 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.
Document 13: Iao Valley: Iao Valley (Hawaiian: "ʻ Ī-ao": "cloud supreme", pronounced similar to "EE-ow") is a lush, stream-cut valley in West Maui, Hawaii, located 5 km west of Wailuku. Because of its natural environment and history, it has become a tourist location. It was designated a National Natural Landmark in 1972.
Document 14: Manoa Falls Trail: Mānoa Falls Trail is a 1.6 mile trail on the island of Oahu in Hawaii. The trail is a part of the Honolulu Makau Trail System, and leads to a popular 150 foot waterfall called Manoa Falls. Hiking the trail is approximately a one-hour round trip. Many tourists are attracted to the waterfall and scenery throughout the trail. The trails have a history as one of the earlier Hawaiian trails. There are many legends of the Night Marchers, or ancient Hawaiian warriors associated with Manoa Falls. Scenes in movies such as Jurassic Park and Catching Fire were filmed at Manoa Falls. The Manoa Falls trail harbors many native Hawaiian plant species and tropical birds as well. The Lyon Arboretum, located in the Manoa Valley at the base of the trail is another popular tourist attraction and aims to preserve endangered Hawaiian plants. Rain showers are very common in on the trail and the path to the waterfall is often muddy and slippery. Flash floods may also occur at any time. Swimming in the pools of water on the trail is highly discouraged due to the threat of Leptospirosis.
Document 15: 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.
ground_truth: Nā Pali Coast