Mysterious Seating Arrangement

Taking a break from writing and gardening, I went for a run at a local park. There is a wide greenway along the creek for many miles. Dirt paths wind through dense foliage near the reliable water source.

This is the second time I've noticed two wooden chairs. Tucked under the shade of cottonwood trees, the trees are almost hidden.

I know they weren't placed here and abandoned. They've moved. 

Who placed the chairs here? I want to assume a nearby resident dragged the chairs down the slope to the shady spot near the creek. My first impression was someone seeking solitude, but there are two chairs.

I have several theories.
1) Teens hiding from their elders to smoke forbidden substances. If so, I'd expect to see evidence of a munchie attack in the form of candy wrappers and soda pop cans, but the area is clean.
2) Young parents in need of a quiet place to escape a harried household.
3) Friends taking a break to vent about work, or dating, or just to share a laugh.
4) Retirees on a fixed income taking advantage of a nearby nature spot when their funds won't support a vacation.

Consider this a writing prompt, or just an imagination stretching exercise. Who do you think brought the chairs to this public greenway? Why? What would you do with these chairs in a relatively secluded spot?

I wonder whether the chairs will remain as the weather becomes cooler.

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