The hike from the parking area to the lava tube takes 5-10 minutes, and the tube itself is only about 50 feet long. If visitors desire a longer trip, they are welcome to wander around anywhere they want in the volcano field.
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The safest and most pleasant way to travel on the Road to Hana is during daylight hours. Leaving around 7 am will leave you plenty of time for driving and a few interesting stops.
Make sure to leave Hana area at least a few hours before sunset. If the roads are open, and your rental car agreement allows, consider driving the backside of Haleakala. You'll watch sunset either from the back of the island or Upcountry near Kula and Makawao, which is pretty amazing.
The Road to Hana—a spellbindingly gorgeous highway that takes travelers over more than 50 bridges and around 600 curves—boasts over 18 waterfalls within a mere 54 miles.
Lava cools very quickly at first and forms a thin crust that insulates the interior of the lava flow. As a result, basaltic lava flows can form crusts that are thick enough to walk on in 10-15 minutes but the flow itself can take several months to cool!