My son and I tent camped at Seminole Canyon State Park circa 2010. We could could see the distant mountains in Mexico on the western horizon. The sunset dimmed to indigo and purple with the long, lonesome vista to the west across sage and limestone country. The night breeze whistled by our tent. Even though you’re in a campground, there’s a wild feel to it. Right off Highway 90, the state park is south of the nearby Pecos River high bridge. RV friendly.

Official map here: https://tpwd.texas.gov/publications/pwdpubs/media/park_maps/pwd_mp_p4501_082b.pdf