Howdy Adriana!
We LOVE
Akershus Royal Banquet Hall. The food is wonderful and the setting is nothing less than magical.
However, given that you have a 5 year old little boy, I'm inclined to suggest
The Garden Grill. The food is delicious and your kids will love the view as the restaurant rotates throughout Living with the Land!
I'm also recommending Garden Grill because of Chip 'n Dale. In our experience, we have had plenty of opportunities to have meet and greets with many of the Disney Princesses. However, we have very few pictures with Chip 'n Dale.
Because your son is such a fan of the mischievous but lovable chipmunks, Garden Grill would be a great way to enjoy a family dinner and get several great photos with Chip 'n Dale. You can visit with the Princesses at other times during your visit to Walt Disney World Resort.
I know that whatever choice you make, you will have a wonderful time and you will enjoy watching your kiddos in the restaurant.
Thanks so much for your question and please let me know if you need any further information. Have a magical day!