If you just think of what items are in your possession most of the time you will find you already carry something that can be used as a alternate weapon such as Keys, Pen's, Pencil's , flashlights and comb/brush etc...
Also pay close attention to your surrounding's when you walk into a store, resturaunt, parking garage or whatever and play a little game of "I spy with my little eye" how many exit's can I find , how many people are 15 ft. from me, what can I use to defend myself with if I had too. I know that it sounds silly but it works. And like the saying goes the mind is your greatest weapon, so dont let it go numb by not keeping it working.
I highly recomend taking some kind of personal self defense training especially if they do some kind of sparring. I take Krav Maga and it's great for me but there are other schools that I hear great things about also you just have to do some research and decide what works for you.
Also since I have been taking Krav Maga for a few months now I have really come to respect the effectiveness of groin strikes. I have started to take my 2 girls (7&12) to the kids classes and when we get home I have them show me what they learned in class. Lets just say that after the first couple of time's we reviewed I started to wear my cup so my 7 year old wouldnt make me lose my dinner.