I was remade into taru form. :( Horrible times. What do women like for christmas? D: Sexy underwear?
Be careful with sexy undies, if you pick the wrong size it's not going to end well for you! Too small must mean you think she's fat and want her to lose weight. Too big must mean you think she's fat enough to fit in them. It's lose-lose.
Smelly bath sets are too generic, unless there's a specific flavor that she loves and you get her that one. Jewelry, only if it's serious. Clothes are a death wish because of the previously mentioned panty problem. If she likes books, games, or movies, you'd be safe with those!