Big Island, Hawaii
The Big Island, a.k.a. Hawai'i proper, is the largest and most southern Hawaiian island. At 4,000+ square miles (93 miles across), it's unlike any other Hawaiian island that can easily be driven around in one day. No, the island is vast and you'll want to take your time exploring the varied terrain - it ranges from the lush greenery you'd expect to a veritable moonscape topography. The world's tallest mountain, Mauna Kea, can be found here along with the world's largest telescope. This is worth a trip as the height combined with minimal light pollution mean you can see 90% of stars visible from earth. Hot dog! Mauna Loa is one of the active volcanoes located in Hawai'i Volcanoes National Park and is also worth a visit but bundle up as this part of the island is cold and windy.