One fun (to me :^) way to raise your metabolism by exercising is: HIIT. High Intensity Interval Training. The article has the info, and there are many other sites with more suggestions on doing it.
The training accelerates your metabolic rate to the point where you experience significant caloric burn during your rest state. Plus, it’s fun!!! Gets you all sweaty and stuff.
Balance your workout with core weight training. Also really fun!!! ‘Cause you get to play with that big rubber ball. :^D
Also, a very effective way to increase your metabolic rate is to snack-meal throughout the day. Instead of eating three square meals, eat six (or more) small ones. Concentrate on raw vegetables and whole foods, and stay away from hydrogenated fats.
If you eat many small meals, your digestive system will work on them all day long, which burns calories of itself.