you can do lots of things haha.
for example if shes at home and your coming home from work or something.
bring home flowers, her favioute chocolate and just say something corny like, i saw these. and i know you love flowers so me gots you thesee, or something hah, all girls love flowers and chocolate ;)
or take her to a hotel, plan a day, Chicks love it when you do stuff and not them planning it.
or leave a note on her bed with your favorite dress of hers, and say dinners at 6, we are leaving at 5. wear this, it looks amazing on you.
blah blah blah.