Texas & The Great Plains
Kansas does not have any public lands established as nudist sites. However, it is worth noting that two of the entities listed below—Lake Edun and Camp Gaea—function essentially as private non-profit day-use parks available for a low entry fee. Both are open to everyone, but Lake Edun is more traditionally family oriented while Camp Gaea has a heavily gay and somewhat counterculture following.
NATURIST RETREATS & OTHER NATURIST-FRIENDLY ESTABLISHMENTS
McLouth (northwest of Kansas City)
Scranton (south of Topeka)
Sandy Lane Club
Hutchinson (northwest of Wichita)
Hippie Hole  43.8932N, 103.3667W is a very secluded swimming hole deep in the forest south of Rapid City, not far from Mount Rushmore. This site sees sporadic nude use.
Conservative Texas is home to one of the top interior nude beaches in the U.S. A short drive west of the liberal oasis of Austin, Hippie Hollow  30.4128N, 97.8825W is a beautiful lakeshore site in a county park where the option of being naked is officially sanctioned. Hippie Hollow is the most popular nude beach in the southern part of the U.S. between Florida and California.
The Austin vicinity has a few other sites that see occasional nude use, although they are eclipsed by Hippie Hollow. Within the city limits, the Barton Creek Greenbelt  30.2489N, 97.8129W is a bit of an "urban wilderness," and there are a couple of spots along the creek where sporadic, discreet skinnydipping occurs. Farther afield about 35 miles west of Austin, Gracy Cove  30.4526N, 98.0318W is an area within Pace Bend County Park where discreet nudity occurs.
After Hippie Hollow, the next most popular nude beach in the state is located along a remote stretch of the Gulf Coast in southeastern Texas. About 60 miles east of Houston, Bolivar-McFaddin Beach  29.5676N, 94.3395W has been visited by nudists at least since the late 80's. Getting there can be challenging because the nude area is accessed via a badly storm damaged road that has never been repaired, but this site has emerged as a relatively safe haven for nudists despite occasional brushes with intolerant authorities in the past.
Padre Island is the 130-mile-long barrier island along the Gulf Coast that extends from Corpus Christi south almost to the border of Mexico. There are two nude beaches associated with Padre Island, one near each end. The more popular and better established of the two is at South Padre Island  26.3132N, 97.1991W , located north of the town of the same name and accessible only by driving along the beach for several miles. This remoteness has made the beach a safe haven for nudists. At the other extreme, North Beach of Padre Island National Seashore  27.4649N, 97.2796W near Corpus Christi is a much less-established nude site where discretion is in order.
In the Dallas area, Queen's Point in Westlake Park  33.0937N, 96.9941W in Lewisville is a lakeshore gay nudist hangout that has seen better days. Crowds diminished substantially after brushes with authorities in the 90's, and nude bathers have never returned in significant numbers, but a trickle of men continue to discreetly sunbathe nude at this hidden spot.
NATURIST RETREATS—near Dallas / Ft. Worth
Poolville (west of Ft. Worth)
Alvord (northwest of Ft. Worth)
Chaparral Resort B & B
Weatherford (southeast of Ft. Worth)
Wills Point (east of Dallas)
Decatur (northwest of Ft. Worth)
NATURIST RETREATS—near Houston and Austin
Emerald Lake Resort
Porter (northeast of Houston)
Lone Star Resort
Navasota (northwest of Houston)
Boling (southeast of Houston)
McDade (east of Austin)
NATURIST RETREATS—south of San Antonio
Edcouch (far south, Rio Grande Valley)
Edinburg (far south, Rio Grande Valley)
PLACES TO STAY—GAY
Camp Circle J
Eustace (southeast of Dallas)
PLACES TO STAY—ADULTS ONLY (not suitable for minors)
Live Oak Resort
Washington (northwest of Houston)
Riverside Ranch Resort
Elmendorf (southeast of San Antonio)