Fraxel restore is a great laser for many things, but it will not give you the tightening you seem to be thinking of. It is hard to give you a recommendation without a photo, so I would recommend a consultation with an experienced physician to discuss your goals and your options.
Fraxel laser can improve surface texture and sun damage but will not give volume to marionette lines. A combination of Thermage radio frequency to tighten the skin and fillers to restore volume will help.