Hawaii: Big island volcanoes

For those of you who have been to Hawaii, if we could relatively cheaply arrange a day trip to the big island (from Honolulu, Oahu, where we’re staying) to go to the Volcano National Park, is it worth it? Per the national park site, there’s only two visible lava flows, and they’re a very difficult hike to get to. You can see the steam vents from a lookout point, and if you come at night, you can see the glow of the lava. But, if we do a day trip, we will not be there at night. We’ll have maybe 3-4 hours to spend in the park, once you figure the commute from the airport.