@tohlman I lived on the Big Island in early 2000s. The hiking there is great, with so many different ecosystems. You can head to the Hilo side and hike through lava tubes and see huge lush scenery and waterfalls. Dont forget Volcanoes NP. Most of the there hiking there is on rough on old lava and it smells really sulfery but is so worth it. You can also just hike to a beach to snorkel or do longer hikes in Wamanu Valley or Mauna Kea. Have fun and dont forget sunscreen!