Lynnie,
Walking is good... another exercise you can do just for your inner thighs is to lie on your back, lift your legs straight up in the air, and lower your legs into a "V" shape, going as far down as comfortable then back up, slowly, to "feel the burn"
I did this in a YMCA class last Tuesday for the lower backs, abs, and legs - I sure felt it the next day hehehe!
Good luck!