North east of Lewisville is Frisco. Stonebriar Mall is reported to be the largest mall in North Texas but there are many other shopping centres set along Preston Road. Large business parks and hotel resorts are springing up and there are more than 120 restaurants in Frisco.
The Shawnee trail is worth a visit and a read. This was the earliest principal route of the Texas longhorn cattle drive which began going through this area around 1840. The cattle were driven from Austin through Waco and Dallas up north along the eastern edge of Oklahoma (as it is now) and up to Kansas City or to Sedalia, Missouri where there were railroad facilities for transporting the herd east especially to meatpackers at Chicago.
Also you should visit Dr Peppers/Seven UP Ballpark and maybe get to see a game. The park opened April 3rd, in time for the 2003 season and is quite different from the normal Americal ballpark.