Kaeleku Caverns
If you're interested in spelunking, take the time to explore Kaeleku Caverns (aka Hana Lava Tube), just after mile marker 31 and a mile down Ulaino Road. The friendly folks at the cave give a brief orientation and promptly send you into Maui's largest lava tube, accented by colorful, otherworldly formations and a lot of fascinating history. You can take a self-guided, 30- to 40-minute tour daily 10:30 am until 4 pm. LED flashlights are provided, and close-toed shoes are recommended. For those who don’t want to explore the caverns, this still makes for a great stop to check out the world’s only red ti leaf maze on the grounds.