Most Helpful Girl
I think an amusement park / carnival would be the best, because you've got a bit of everything there:
- games (for some healthy competition, and you get the prize regardless of who wins :D )
- fast rides (did you know that shared adrenaline rushes can cause and enhance attraction between people?)
- slow rides (for a more romantic moment)
- and lots of walking space, so you two can just walk around hand in hand.
Plus, it's generally less awkward if you don't know the person well because there's lots to see and do, so you're not stuck there trying to think up a conversation topic.