Girl friend's surprise birthday party?

So for my gf bday party I was thinking abt getting a bunch of friends and go to Disneyland. When we were there like 2 months ago she was telling me how she always wanted to eat at the blue bayou, the restaurant inside the pirates of the Caribbean ride. So based on that I made a reservation a month ago and her bday is in September. But now I'm having doubts becuz she already had a bday party at dland on her 18th and this will be for her 20th. I'm kind of starting to think it's too repetitive, but she LOVES Disneyland. Shud I stick to this surprise party or do something else for her surprise party? Ideas please and thank you.