Lateral Thinking Puzzles - third time is best!

Yes.

Did Nancy misinterpret something in the paper as being the coordinates
of buried treasure ?
Is the newspaper actually relevant (eg, did she hear something on the
radio while she was reading the paper) ?

reply to pjd:
Did Nancy misinterpret something in the paper as being the coordinates
of buried treasure ? No.
Is the newspaper actually relevant (eg, did she hear something on the
radio while she was reading the paper) ? Newspaper is relevant.

Did something in the newspaper remind her that she’d left something in the park?

Would it also have made sense for her, on reading the same stories and otherwise experiencing the same morning, to go to some other park? Or to some non-park recreational space?

Would she be expected to spend most of the day at the park? More than an hour? Just long enough to do something quick and go right back home?

Was the understanding she reached while reading the paper true and accurate?

To expand on this: You said that the newspaper was relevant, but was anything else she saw, heard, or otherwise experienced while reading, but which was not mentioned in the puzzle description, also relevant?

No.

reply to Chronos:

Would it also have made sense for her, on reading the same stories and otherwise experiencing the same morning, to go to some other park? Possibly. Or to some non-park recreational space? Possibly.

Would she be expected to spend most of the day at the park? No.More than an hour? No.Just long enough to do something quick and go right back home? Yes.

Was the understanding she reached while reading the paper true and accurate? Yes.

To expand on this: You said that the newspaper was relevant, but was anything else she saw, heard, or otherwise experienced while reading, but which was not mentioned in the puzzle description, also relevant?
Nothing else of note.

In order to do what she was going to do, did Nancy have to act immediately?
Could she have waited until the next day?
Was the weather a factor?
Was any other person involved?

reply to dirtball:

In order to do what she was going to do, did Nancy have to act immediately? Yes.
Could she have waited until the next day? No.
Was the weather a factor? I guess…
Was any other person involved? No.

Was there an eclipse?

Was it essential that she go outside?

No.

I don’t know if I’d call it essential, but I don’t readily see how else to make the gag work.

Was her decision not actually primarily to go to the park, but primarily to get out of the house, and the park just happened to be the most convenient place to go?

reply to thorny_locust:

Was her decision not actually primarily to go to the park, but primarily to get out of the house, and the park just happened to be the most convenient place to go?
No

Did whatever caused Nancy to go to the park

cause her to physically feel good?
amuse her?
stop something bad from happening?

reply to colinfred:

Did whatever caused Nancy to go to the park

cause her to physically feel good? No.
amuse her? No.
stop something bad from happening? Possibly….

Was she trying to improve her health?

Was she satisfied after visiting the park that she accomplished her goal?

reply to Cheesesteak:

Was she trying to improve her health? No.

Was she satisfied after visiting the park that she accomplished her goal? Yes.

Could she have accomplished her goal by going somewhere other than the park?