Hi Shannon:
This question has many correct answers. I recommend
Animal Kingdom Lodge, especially if you reserve a savanna-view room where your family can watch the animals walk by right outside your window. Upon entering the Animal Kingdom Lodge, your family will be mesmerized by the dramatic lobby expertly themed and filled with African artwork, artifacts, a fireplace (at Jambo House), and huge windows. The pools are great at Animal Kingdom Lodge. Animal Kingdom Lodge Jambo House is home to the 11,000 square foot Uzima pool. The pool boasts a 67-foot slide as well as a tyke-friendly wading pool area. Not far away is a kids playground. Animal Kingdom Lodge Kidani Village is home to the wonderful Samawati Springs pool and kids water playground.
I also recommend The Contemporary Resort, one of the original Walt Disney World Resorts. I still remember the wonder I felt as a six-year old staying at the Contemporary Resort and watching the monorail run right through the A-frame Tower and marveling at the lobby's 90-foot, floor-to-ceiling ceramic mural created by Disney Legend, Mary Blair. Your ten year old may also appreciate the awesome Stormalong Bay pool (best Resort pool, featuring a major water slide and lazy river) at Yacht or Beach Club.
If you are looking at a Value Resort, I believe Pop Century and the new Art of Animation have the best themeing.
Of course, all my boys look for is
a Resort with a playground.