Combine maple syrup, soy sauce and garlic in a small bowl.
Lay two pieces of foil slightly overlapping in a 9x13 baking dish. Place salmon skin side down on the foil so that you can bring the sides of it up and over the fish and close to bake.
Season salmon with salt and pepper and pour maple mixture over it. Close foil and allow to marinade for 30 minutes-- no longer.
Place in a preheated 400 degree oven and bake still covered for 15 minutes. Open the foil and cook for an additional 3-5 minutes under the broiler to caramelize the top. Fish is done when it flakes easily in the thickest part.