In a large bowl, stir together the instant vanilla pudding mix and the entire can of crushed pineapple (with juice).

Gently fold in the thawed Cool Whip, mini marshmallows, shredded coconut, and chopped pecans until well combined.

Cover the bowl with plastic wrap and refrigerate for a couple of hours to let the flavors meld and the texture firm up.

Serve chilled as a light and refreshing dessert.