I wouldn't tell her she's the one or I love you on the first date. But being romantic can be really corny if it's not spontanous (or whatever the word is.)
Taking her to the movies is cool but you won't be able to talk a lot. I don't know, I usually just walk around with the girl and laugh with her, fucking around this kind of shit. I wouldn't be the romantic type of guy at a first date, it wouldn't be really natural for me.
Then we would lay somewhere in a field while watching the stars and when she would close her eyes.. BAM! I'd piss on her.