Hawaiʻi Volcanoes National Park is absolutely stunning (and safe, away from the closed area). It's like being on a different planet. If you haven't been to the Big Island and the park, you should add it to your bucket list.
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That said, I second visiting the Big Island and visit various sites. Driving less than an hour and going from barren volcanic landscapes to lush rainforests was something else, and watching the sunset from Mauna Kea was magical. And lots of great beaches, and most that weren't next to a resort had very few people.
While the island is big relative to the other Hawaiian islands, its small enough that you can drive around it in a day.
I'd recommend staying on the Kona side, which is the dry and somewhat barren side. The Hilo side has rainforests for a reason.
I loved going up Mauna Kea visitor center and stargazing. At ~11,000 feet, it's one of the best places in the world for naked eye stargazing. You're literally above the clouds, the island has strict rules about exterior lights at night to minimize light pollution, and you're above the thickest air. I wasn't expecting to see the Milky Way so easily.
https://en.wikipedia.org/wiki/Milky_Way#/media/File:Milky_Wa...
