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Pour 1/2 cup of the marinade over fish in large resealable plastic bag or glass dish; turn to coat. Refrigerate 30 minutes.
Mix mayonnaise, sour cream and remaining 1/4 cup marinade in large bowl. Add coleslaw mix; toss to coat well. Set aside. Remove fish from marinade. Discard any remaining marinade. Place fish in center of large sheet of heavy duty aluminum foil, grill pan or grill tray.
Grill or broil fish over medium heat 3 to 4 minutes per side or until fish flakes easily with a fork. Brush with additional fresh marinade, if desired. Serve fish in tortillas topped with coleslaw.