Super idea!! What you have listed already is great!

Maybe a bottle of bubbly (or sparkling cider) and 2 fancy glasses.
Chocolate dipped strawberries.
Coupon for a date to her favorite restaurant, followed by a stop at the local make-out spot for some heavy necking.
A remote vibe, she wears, you have the control box
A couple of pretty silk scarves to use for blind fold, tying wrist, etc

Happy Anniversary!! How long have you been together?