I would spend it at a really fancy restaurant, then spend the evening strolling around shopping, eventually camping out over a cliff watching the sunset. Then I would spend the night looking at the stars, confessing my love to the girl, then spend the whole night awake and sit with her watching the sunrise kissing her.
Reading together under a green flourishing tree.
That'd be personal but fine if you ask!
Umm .... A drive in the green mountains.....a lunch at a pass-by restaurant and a sleep under the stars!