Great space in just about as perfect a location as you could ask for if you're wanting to spend time in Volcanoes NP. If the lava is still flowing, you even get to see red sky from the rental!
It seems the "go early in the morning to the volcano to beat the crowds after sundown" tip has spread quite a bit. We got there around 4:30am and it was only a few of us (with a few hiking out). By 5:00 or so it was PACKED. Way more people than were there in the daylight hours. So, maybe between midnight at 4am is the move? I suppose that's harder if you want the sunrise, but you could go back up the trail a bit for sunrise, TBH. (The gates are open all night and you want the Desolation Trail parking lot, then walk west on the road.)
Also, Volcanoes NP has unfortunately had to ask people to be more careful while driving thanks to a couple of nene (goose) strikes. Plus there was a gross amount of trash on some trails. People, please. Do better.
Be prepared to have some difficulty if you're a late eater, as most of the places nearby are closing early or even closing 2-3 full days a week. It seems to be somewhat fluid, too, so that even updated hours on Google/Yelp will be wrong. Bring in a few things to make meals of your own or some heavy snacks if you don't feel like hunting much. But you can drive 15min to Frankie's in Mountain View for decent pizza, or go on a little farther to Hilo for late-night eats.