I live in Grapevine. I still haven't decided if the Gaylord is enormously cool or enormously tacky.
Take some time to walk around the place. There is a lot to see.
They have a spa. Make an appointment for some cool treatment. Sit by the roaring fire in the lobby and read a magazine.
There is an indoor pool and an outdoor pool. You'll probably need to stick with the indoor pool.
Very near the Gaylord is Grapevine Mills Mall. It is sort of an outlet mall (some stores are, some aren't.) They do have outlet stores for Abercrombie, Gap, Chicos, Ann Taylor, etc. There is a Virgin Megastore. There is a Rainforest Cafe if you're interested.
Next to Grapevine Mills is the Bass Pro shop. The decor is pretty over the top. The restaurant that is connected is not so good, but I've heard that the microbrew beer is good.
Historic Downtown Grapevine is cute...worth taking a few hours to walk up and down the streets. If the weather is nice, sit outside at a school desk and have a terrific sandwich at Nero's Heros, on the corner of Main and Northwest Highway. If you want a nice dinner at a locally owned restaurant, try Cafe Italia, just a little further down on Northwest Highway. Call and reserve in advance for Saturday night. If you want expensive steak, try Silver Fox in Grapevine.
If you're just in town for a weekend, I think you could stay plenty busy just enjoying the Gaylord, shopping at Grapevine Mills and Bass Pro and exploring downtown Grapevine.
If you want "upscale" shopping, don't go all the way to Frisco...head to Southlake Town Center, which is close and cuter. If you're there, don't miss Milwaukee Joe's for ice cream.
If you need more restaurant recommendations, let me know.