lonelyrk: dinner or a drink and get to no one another.
Honestly...if it's nice and warm outside I would find a park, river, or some place accommodating for two people to sit without being disturbed...but still not alone.
If it's cold...maybe a coffee shop.
I'm not big on going out to eat....but hey others might enjoy it.
It's also nice to ask your date if they have a preference. They may have other ideas that are more romantic and secluded. Everyone is different.