I flew in and out of there the first time I visited, it was so cool. Japan is an infrastructure nerds dream.
It didn't feel like being on an island at all, since it's entirely developed. But once you hop on a train you shoot out across the ocean and it's quite spectacular.
I recommend going up to the viewing tower if you have time before your flight, it's an inimitable view.
A couple of years after it was built I stayed high up in the hotel that is immediately on the mainland with a view directly along the bridge to the island.