The following four activities are exclusive to the Big Island – they are not possible on any other Hawaiian island:
The Hawaii Volcanoes National Park which offers stunning and ever changing landscapes.
Visiting the Mauna Kea summit with its world-class telescopes for stargazing and out-of-this-world sunsets.
The manta ray night dive/snorkel.
Seeing red-hot lava (only when the volcano is active).