I cannot vouch for the veracity of the image or its location in a public park. But the comments from individuals on Nextdoor were interesting because of how they broke along gender lines. Most women who commented were shocked and saddened at the noose display. Men who commented were generally dismissive and sarcastic in their replies.
Most of the homes that are most directly threatened by a fire at Folsom Lake are in Granite Bay and El Dorado Hills. There are only a few scattered homes above and around the Peninsula Campground. Ironically, it is the peninsula that has some of the best fire suppression features. There are more meadows with fewer trees. Fewer people visit the Peninsula Campground Park because it can be difficult to access, especially when towing a boat, from Highway 49. There are also wide dirt roads that act both as fire break and allow for fire trucks to reach areas burning. In contrast, large swaths of Folsom Park land in Granite Bay and El Dorado Hills have only small dirt footpaths with limited access for large fire trucks. There is more human activity in these areas as they are close to recreational access points.
The big attraction is the covered bridge built in 1862 after floods washed out the previous structure. The Point Defiance trail loop provides great views and takes you through a variety of ecological settings.
Joshua Tree National Park, adjacent to the Coachella Valley, is a natural wonder theme park. From elevations of 2000′ to 5700′, it is high desert country.