An early ADR for Crystal Palace can be made for before Magic Kingdom opens. If your son normally wakes up early, this is a great ADR to have. When the ADR is before park hours, you can walk down a mostly empty Main Street, which makes for great photo opportunities, esp. of Cinderella's Castle.
The food at Crystal Palace, has always been good and we have always had great character interaction with Pooh, Piglet, Eeyore, and Tigger. This meal was the first time our daughter, then 23months old, met characters. She loved it. Fantastic experience all around. It's now a tradition.