What will amaze my partner for her birthday in early December?

Well what you need to find out is whats going in your city, like concerts, festivals, theme parks, sports games etc. You could take here anyone of these places and find out if you could have here name in lights wishing her a happy birthday. Maybe a hot air ballon ride you really have to research I suggest you start ASAP December is around the corner. Well good luck and thats great you want to do something mind blowing....