Not sure how much room you have, and not trying to sound sexist, but what about a play kitchen. My kids (boy & girl) absolutely loved ours - they were always "cooking" something and having tea parties, picnics, etc. Not sure if this had anything to do with it but my kids are teenagers now and both love to cook!
What about:
A wagon - Radio Flyer - one of them with the wooden sides you can put on or take off. My parents got my kids one and they used it all the time and loved being able to put the sides on/off.
Something musical - we had the standing microphone and a couple guitars. Of course we had concerts all the time. That was fun!
A Vanity - there are a few styles now that run from plain to extravagant! Drawers, etc. to keep all kinds of hair stuff, etc.
Then of course the typical doll house!!
Good luck and Merry Christmas!!