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Travis Barker 's on dad duty for a magical day out with his family ... holding his toddler, Rocky , close to him while hanging at Disney's Magic Kingdom!

The rocker was spotted at the popular Florida theme park Saturday afternoon ... holding his little dude in his arms and basking in the late summer sun in Orlando. TMZ.com

Travis dressed casually in a white T-shirt and long black shorts ... while Rocky's dressed up in plaid overalls.

We're told these two -- along with Kourtney Kardashian and two other kiddos -- had just finished up having a meal at the Pinocchio Village Haus restaurant, and they were on their way to the Peter Pan Flight's ride ... perfect for a youngin' like the little Kar-Barker since it doesn't have a height requirement. TMZ.com

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