Firstly, Happy Anniversary :)
You should give her something she’ll remember for a long time- something really thoughtful like organise a day out with her by the beach. You don’t need to spend a lot of money for it. And contrary to @OneMoreMinute I don’t think romantic dinners are necessary either.
Make it fun, enjoyable and most inportantly, comfortable for the both of you!
It’ll be my first anniversary too 2 days before Valentine’s and I can’t wait :)
Hope you two have an everlasting relationship filled with passion and good things!