Hi K.,
I do not recommend the Tanglewood Resort at Lake Texoma (if you were considering that option). Although it looks nice over the Internet, it is NOT worth the money. My DH and I took our then 8 month old son to Tanglewood last summer and had a horrible experience. If you need more details on my negative thoughts of Tanglewood I could write a novel.
This summer we took our now 19 month old son to Glen Rose, TX (about 1 1/2 hours from Coppell). We stayed in a Master Suite (2 bedroom, 2 full bath with separate sitting area and table) at the Best Western Dinosaur Valley Inn & Suites. It was affordable, clean and nice. Also, the hotel served a complimentary hot breakfast and complimentary evening hors-d'oeuvres. Finally, the hotel has a 1 1/2 ft children's wading pool that is mostly shaded. The only thing it lacked was a day spa for Moms. Also, we drove through the Fossil Rim Wildlife Park the next morning, which our son enjoyed (for the most part). He slept through the last half as it was nap-time. I hope this helps.
S.