https://commons.wikimedia.org/wiki/File:Hippie_Hollow.jpg

From Wikipedia:

Hippie Hollow Park (originally known as McGregor County Park) is a park located on the shore of Lake Travis in northwest Austin. It is the only legally recognized clothing-optional public park in the State of Texas.

Hippie Hollow Park has been used as a nude swimming spot for years, because the area was along a particularly remote section of the shoreline of Lake Travis. The area became more popular in the 1960s due to the cultural changes of that era and, after Woodstock, the nickname ‘Hippie Hollow’ was born. Hippie Hollow was controversial in the 1970s, due to increased skinny-dipping which generated complaints from adjacent landowners. Raymond Frank, the sheriff of Travis County from 1973 to 1980, determined that the county’s law enforcement budget was better spent on more serious offenses, and skinny-dipping activities were generally ignored as long as no other laws were being broken.

I assume that this is the same woman based on the hat.

[Nude women seen from behind] [Vaginal fingering] [Outdoor sex] [Nude women crawling] [Nude women, bare feet apparent, soles exposed] [Hippie Hollow Park] [Nude women with hats] [2010s erotic art]