Thurston Lava Tube (Nahuku), Hawaii Volcanoes National Park

A must do! It is illuminated slightly but I'd recommend bringing a headlamp so you can REALLY see the lava tube. My kids brought there's and I'm glad they did! Cell phone light won't work at all. Headlamp isn't required, but you'll be glad you brought it if you have one

This is a must see if you have kids. The walk down is easy, my 2 year old made it. The tube is well lit, and fun for all to see. This tube is much more accessible and safe than many other tube or caves you could find.