Preheat oven to 350°. Bake pastry shells on a baking sheet 3 to 5 minutes. Cool completely (about 30 minutes).
Beat cream cheese, sugar, and vanilla at medium speed with an electric mixer until blended. Fold in whipped topping. Spoon or pipe cream cheese mixture into pastry shells. Cover and chill 2 to 8 hours.
Meanwhile, stir together pecans, coconut, and butter in a small bowl. Spread mixture in a 9-inch square pan. Bake at 350° for 10 to 15 minutes or until toasted, stirring occasionally. Let cool 30 minutes. Sprinkle each tart with about 1 tsp. pecan mixture. Drizzle with caramel topping, if desired. Serve immediately.