Hi.
Why not simply, not plan?
I think you're doing yourself a disservice by thinking about it being anything other than a meet-n-greet.
Don't "try" too hard, we don't like that, it smacks of desperation (I am not saying you are, simply what CAN be perceived by some)

For a first date off an online dating service, personally I would want a daytime trip to a museum or something like that (something SHE enjoys), followed by lunch.
Unless she suggests dinner, of course.

Don't ask if she would like to go out again at that time.

I'm sure that you are aware of how to charm....hold doors, let her go first, listen with interest and concern....blah blah blah....you know the drill, I'm sure.

Most importantly, treat it as it's own thing and have a good time.