I generally just avoid sweets during Lent, but it's not one my hard fasts.
I'm giving up TV, and limiting internet to 1 hour a day. That in itself is huge for me, sad to say. Then I'm following the 40 Days For Life devotions, which can be found at 40daysforlife.com and getting into a Daily Rosary, to be offered for the Holy Father, my own sanctification, and a Catholic sister who is having a very hard time and posted about it here on Yahoo Answers. I'm taking up exercising as a corporeal mortification too.
I have a friend who is giving up fast food and Starbucks and smoking, all good for her body and a good sacrifice because she loves all three things. Last year I went vegan for Lent, which was incredibly hard, but very traditional.
Don't just fast - increase Prayer! Perhaps part of your sacrifice could be money - donate more to charity, especially Catholic Charities and pro-life ones.