Go scare people in haunted houses (you know, like hide in there and such instead of going all the way through it)
Find a nice dark place also... and... well, one thing leads to another ^_^ Making out and such is SO much better in general when there are people really close and they dont know ^_^ (for example, in the back of a car when her parents are driving (I mean like a van lol)
Another thing, which I have done several times, is to go climb a water tower that we have here in town... I am not sure of your situation lol, but where I am from there is one with like... half a fence and no lights around it. and its pretty awesome because it is at the top of the hill my town is built on.
Yet another one... well, if you want romantic, well I guess you could always... hmm... I cant think of anything...
Are you talking about Romantic as in soft music, dinner, candles...etc, or romantic as in... like making out and sex (hopefully lol) and stuff?