I know a guy who went and planted cacti in copious quantities outside his daughter's window as soon as they found out it was a girl, in anticipation of future teenage escape attempts. I'm not saying it was a good idea or bad idea, but it might be cheaper than more guns.
FWIW, it's a total crapshoot whether little girls end up "girly" or not. My wife is kinda tomboyish (which is why I like her), and I'm a kill-my-own-meat-and-cut-it-up-with-the-knife-I-made kind of guy, and my 3 year old girl loves pink, princesses, and ballet. It comes out of nowhere! She did pick up an earthworm yesterday that she thought was pretty cool, so maybe all isn't lost. As long as she turns out capable, thoughtful, and relatively self-sufficient, she can wear all the pink she wants.