I have been with this girl for about 1 year and a half we're not officially dating for the simple fact that her family didn't agree on it, so I finally have to ask her out after all this time but I can't think of any romantic ways to do so ,she tells me she wants it to be memorable. I guess is kind of like as if I was proposing to her.Can anybody help me with this?

What is a favorite activity of hers that she dreams of doing? How well do you know her? With most women, it's the little things that matter. Tell her you want her to be happy with the "date." Ask her to suggest some things that she would like to do.

She sounds like she wants something BIG and memorable. It's not a proposal, so you don't have to be as lavish...

Why not get her a big bouquet of long stem roses, (red or pink. She'll know they cost a fortune too because WHO WOULDN'T!), pack up a picnic basket of cheese and yummy bread. Get some juicy grapes and a bottle of white wine, (so your teeth don't get stained... ). Take her to a place that has a view... Don't forget the blanket you need to sit on. If it's getting cooler outside, due to the change of weather, don't forget the blanket that you'll need to cuddle up in too... lol.

What woman doesn't like a romantic picnic w/ her man? It's sexy AND thoughtful.