Hawai’i Volcanoes National Park.
If you ‘d prefer to see some live volcano action, head southeast to this unique national forest, where Kilauea, the world’s most active volcano, has been emerging continually considering that 1983.
Outside the park borders, depending upon conditions the day you go to, you may even be able to see fresh molten lava streaming into the sea (which is slowly however undoubtedly making the Big Island even larger, every year).
But even if the volcano goddess Pele isn’t working together, there are still a lot of interesting sights within the park’s confines: hollowed-out lava tubes, steaming craters, tropical rainforest and old lava routes.
Rangers offer guided walks and other activities at the visitor center. For details on volcanic activity, the National Park Service has useful updates (plus lava web cam).