It’s hauntingly beautiful, immensely geographically and culturally significant, and home to more adrenaline-boosting activity options than you could cram into a week. The massive Haleakala volcano is Maui’s highest peak and makes up 75% of the island’s landmass — Haleakala is Maui, in so many ways. Hiking through the Haleakala National Park was one of the…