Dude its about the actions not the present.
1. Make her breakfast. Fresh fruit, pancakes fresh oj with champagne.
2. Leave her house or if you both live together, your house and get flowers with a gift certificate delivered like 5 minutes after you go. Give her an hour anf a half message.pedicure/manicure at a good salon. should run ya like 100 bucks.
3. text message her once during the day to ask how everything is going.
4. Later drop by after work or school or whatever with Dinner reservations at a place which is special to you. first date, first kiss whatever.
5. set up you room at home with flowers and candles or if you with your rents and this isnt available get a hotel room and set it up sometime during your day.
she will rememebr that birthday forever and will be so amazed with you, you wont have to do shit till like christmas.