I don't think Hawaii is a country, but I'd love to go there.
I'd love to go to Hawaii someday even though it's not a country.
この場合、次のような言い方ができます。
ーI don't think Hawaii is a country, but I'd love to go there.
「ハワイは国ではないけど、ハワイに行ってみたい」
ーI'd love to go to Hawaii someday even though it's not a country.
「国ではないけれど、いつかハワイに行ってみたい」
ーIt's not a world heritage site, but I really like Mt. Fuji.
「世界遺産ではないけど、富士山が好きです」
ご参考まで!