Group fishing/camping in Texas or border of Oklahoma/Arkansas

Myself and a group of up to 6 of my friends (group total 7) are looking to go camping near a river or lake in the state of Texas, though we’re also amicable for sites close to the border of either Arkansas or Oklahoma. I do also want to clarify that East Texas is also fine. We’d like to stay for upwards of a week. Two of us are Eagle Scouts so primitive sites would work just fine too. If anyone’s got any suggestions, we’d be more than appreciative.