Help!!! i need serious leg toning advice!! 10 pts!! :)?

Plz read my question! I am 5'5" about 160 lb 34 yr old female. I've lost weight in past & wkin on losing more now. Backs of thighs & are squishy w/cellulite & I want to make it look lean. Plz sum1 give advice I can do in gym to tone up my legs. I am walkin @ least 4-5x/week for about hr @ a time. Usually lift weights but back hurts & was told not to right now. Plz I want to have my legs look smooth, I've never felt comfortable to wear shorts & want to look good by spring/summer!! Thank u!!