So you really think that's the best thing to do at an anniversary? You gonna be like "Hey baby, we got anniversary, I gonna show you my present in the bedroom eh"?. I wanna see how that works
As far as I know her, she's as chilled as you are, so I think she doesn't expect anything big. I'd propably get something to eat (nothing big), and get to a nice spot, like, where you can see the whole town at night, with all the lights shining, while looking at that, you'd eat a bit, huggle up and relax.
No idea if you get what I mean nor if you like that kind of "date". Anyway, I wish you luck.