Claudine C.
Yelp
Arrive early, stay late. Kilauea is definitely a full-day experience at least. Bring sturdy shoes and layers - this was actually the first place in Hawaii where I felt a tad chilly (in mid-May). We were lucky enough to arrive on a day of one of the 4 yearly hula shows at the park and were treated to a beautiful performance. If you try to arrange your visit around this show, make sure to remember to bring blankets or folding chairs as the audience gets a nice, grassy patch of lawn for viewing. And... well... lawns can be a bit damp...
Among the things you can do:
1) If you're hungry and it's around lunchtime, visit Volcano House that's conveniently close to the entrance and visitor center. This is the only place you'll be able to purchase food in the park. Make sure to pack food if you're planning on being here for a whole day.
2) Check out the Volcano Art Center Gallery for some beautiful local art that is surprisingly, very reasonably priced. A great resource if you're looking for some unusual gifts to bring to the folks back on the mainland.
3) Do the Kilauea Iki crater hike - descend onto the crater floor, marvel at the steam vents and hardy lehua flowers growing out of what seems to be very hard, very dead, very rough lava rock. This took us about a little over 2 hours, and we were able to hike through both lush forest and desolate crater.
4) See the Pu'u Loa Petroglyphs - simply remarkable. From Chain of Craters Road, it's about a mile to the petroglyph fields. Hiking is along fairly flat along lava rock and occasional sandy earth.
5) Attempt to see live lava flows - check in with the visitor center first. We had planned to arrive at the start of the trail around 4pm and make the trek out to see glowing lava in its full glory in full darkness but were slightly dissuaded when the rangers told us that we'd be making our way in pitch darkness over some very rough and unforgiving terrain *and* that it'd probably be around 1am when we made it there and back. Instead, we found a ranger with a telescope some 6 miles out from the flow, and were able to get a very nice view of the hot magma rolling into the sea, emitting huge clouds of steam.
And as much as I hate to admit it, and SUV is pretty useful in traversing these parts of the Big Island. Also, we found Andrew Doughty's "Hawaii - the Big Island Revealed" indispensable.