sqauts, running, riding a bike! lots of it!
walk walk walk. its the only way, wen u go on a diet u may lose the weight on ur upper body instead of the lower body so do aerobic exercises like swimming , walking , jogging, running.or do pilates(wit the aid of a dvd ) or yoga. doing this will help tone up ur thighs.wen ur toned up the stretch marks will disapear!
I have huge thighs too, i have read around on how to get them smaller and the only thing you can do is walk walk walk, or run or jog. i hate my big thighs!! good luck!