Many people don't realize that the Haleakala people see is literally only the tip of the iceberg. The east side of Haleakala continues down 18,000 feet below sea level. The crater on top of Haleakala is where astronauts trained for landing on the moon. You can ride horses across the crater. Clear sunrises are spectacular but cold; bring warm clothing. On clear days you can see the big island of Hawaii. The silversword plant grows only on the top of Haleakala. The switchback road can test your patience and your car's brakes, but the trip is worth it. The seven pools on the east side of Haleakala National Park are also interesting if you decide to go to Hana and beyond. Also, visit the towns "up country" on the west slope of Haleakala.