Final answer:
The highest peak of the third tallest mountain in the Hawaiian Islands associated with the sun is Haleakala on the island of Maui.
Step-by-step explanation:
The highest peak of the third tallest mountain in the Hawaiian Islands associated with the sun is Haleakala, also known as Pu'u 'Ula'ula. Haleakala is a massive shield volcano that forms more than 75% of the Hawaiian Island of Maui. The name Haleakala means "house of the sun" in Hawaiian, which is fitting given that the summit of Haleakala is a popular spot for viewing sunrise.
This peak is not to be confused with Mauna Kea, which is the tallest mountain in Hawaii when measured from its oceanic base, or Mauna Loa, another massive volcano on the Big Island of Hawaii, known for its active volcanic behavior.