Question: What 64.4 mi long stretch of Hawaii Routes 36 and 360 which connects Kahului with the town of Hāna in east Maui, contains 11-acre nature preserve Spirit of Aloha Oceanfront Botanical Garden? 

Context paragraphs:
Kahanu Garden: Kahanu Garden and Preserve is a botanical garden located on the Hāna Highway (close to the 31 mi marker) near Hāna, Maui, Hawaiʻ i.  It is one of five gardens of the non-profit National Tropical Botanical Garden, the others being McBryde, Allerton, and Limahuli Garden and Preserve on Kauaʻ i, and The Kampong in Florida.

Inniswood Botanical Garden and Nature Preserve: The Inniswood Botanical Garden and Nature Preserve (123 acres), more commonly known as Inniswood Metro Gardens, is a botanical garden and nature preserve located at 940 South Hempstead Road in Westerville, Ohio.  It is open daily from 7 am until dark without admission fee.  It is part of the Metro Parks system of Columbus, Ohio.

Hakgala Botanical Garden: Hakgala Botanical Garden is one of the five botanical gardens in Sri Lanka.  The other four are Peradeniya Botanical Garden, Henarathgoda Botanical Garden, Mirijjawila Botanical Garden and Seetawaka Botanical Garden.  It is the second largest garden in Sri Lanka.  The garden is contiguous to Hakgala Strict Nature Reserve.

Spirit of Aloha Oceanfront Botanical Garden: The Spirit of Aloha Oceanfront Botanical Gardens also referred to as "The Gardens", is an 11-acre nature preserve located just off the Hana Highway on in Haiku, Hawaii on the island of Maui.  It overlooks Ua'oa Bay in the Pacific Ocean and Papanui o Kane Hawaiian island.  The historic was originally granted by a Land Commission Award by the Kingdom of Hawaii Department of the Interior in 1848.

Wesselman Woods Nature Preserve: Wesselman Woods Nature Preserve is a 240 acre nature preserve located in Evansville, Indiana.  It is a National Natural Landmark and a State Nature Preserve owned by the City of Evansville and operated by the non-profit Wesselman Nature Society.

Hana Highway: The Hāna Highway is a 64.4 mi long stretch of Hawaii Routes 36 and 360 which connects Kahului with the town of Hāna in east Maui.  On the east after Kalepa Bridge, the highway continues to Kīpahulu as Hawaii Route 31 (the Piilani Highway).  Although Hāna is only about 52 mi from Kahului, it takes about 2.5 hours to drive when no stops are made as the highway is very winding and narrow and passes over 59 bridges, 46 of which are only one lane wide.  There are approximately 620 curves along Route 360 from just east of Kahului to Hāna, virtually all of it through lush, tropical rainforest.  Many of the concrete and steel bridges date back to 1910 and all but one are still in use.  That one bridge, badly damaged by erosion, has been replaced by a portable steel ACROW bridge erected by the United States Army Corps of Engineers.

Hawaii Tropical Botanical Garden: The Hawaii Tropical Botanical Garden (17 acres) is a nonprofit botanical garden and nature preserve located on the 4 mile scenic route off of Route 19 at 27-717 Old Māmalahoa Highway, Pāpa'ikou, Hawaii (island), Hawaii.  It is open daily except Thanksgiving, Christmas, and New Year's Day.  An admission fee is charged to the general public, those with a military I.D. are admitted free of charge.

Fernwood Botanical Garden and Nature Preserve: The Fernwood Botanical Garden and Nature Preserve is an arboretum, botanical garden, and nature preserve located at 13988 Range Line Road in Buchanan Township, Michigan.  It covers an area of 105 acre .  It is open to the public; an admission fee is charged.

Bad Branch Falls State Nature Preserve: Bad Branch Falls State Nature Preserve is a 2639 acre nature preserve in Letcher County, Kentucky.  Originally dedicated by the Kentucky State Nature Preserves Commission on September 26, 1985, the preserve originally covered 435 acre and included Bad Branch Gorge, a forested gorge with a 60 ft waterfall tumbling over sandstone cliffs on the south face of Pine Mountain.  Subsequent acquisitions have expanded the preserve west into the Presley House Branch watershed, northeast into the upper reaches of the Bad Branch watershed and a small portion of the north face of Pine Mountain.  The preserve also protects Kentucky's only known nesting pair of common ravens. Bad Branch has been designated a Kentucky Wild River.  There are 7.4 mi of foot trails and bridges over uneven strenuous terrain.

Limahuli Garden and Preserve: The Limahuli Garden and Preserve (17 acre of garden, 985 acre of preserve) is a botanical garden and nature preserve on the north shore of Kauaʻ i island, Hawaiʻ i.  It is one of the five gardens of the non-profit National Tropical Botanical Garden.

Supporting paragraphs: Spirit of Aloha Oceanfront Botanical Garden Hana Highway
Answer: Hana Highway