Prepare peach salsa: Combine first 8 ingredients in a bowl; toss gently.
Prepare grill. Place fish on grill rack coated with cooking spray; grill 6 minutes on each side or until fish flakes easily when tested with a fork. Sprinkle fish with 1/4 teaspoon salt and pepper.
Prepare tacos: Warm the taco shells according to package directions. Cut the fish into 8 pieces, and place 1 piece of fish in each taco shell. Top each taco with 1/4 cup peach salsa, 1/4 cup shredded cabbage, and 1 tablespoon cilantro.