Hi Cecilia,
Absolutely! My family loves touring other resorts during our Walt Disney World visits, either to eat or just to walk around and take in the decor. You will love the Cars area of
Art of Animation. You'll feel as if you dropped directly into Radiator Springs and will have lots of opportunities for great pictures with Mater, Lightning McQueen, Luigi and more. (I also love the food court there,
Landscape of Flavors, if you want to eat as well.)
The free Disney transportation does not go directly from resort to resort. The easiest way for you to get to Art of Animation would be to catch a Disney bus there from one of the theme parks or Disney Springs. To get from Art of Animation back to
All-Star Movies, you would need to catch a bus to a park or Disney Springs, then transfer to your resort's bus.
Your other option would be to use a taxi or a car service such as Uber to get from Art of Animation back to your resort. That would be faster but not free. The cost should be less than $20.
Thanks for visiting the Disney Parks Moms Panel, Cecilia. Please let us know if we can help in any other way. Enjoy your Walt Disney World vacation with your family!
Wilma