Yes. Open 7 days a week.
Yes it's really good..
there is nothing stopping you walking here on a sunday - however, if you were getting there by bus, there may not be as many buses. I know the 82A that used to go there from Liverpool has ceased and changed to the 500-and I have been unable to get a paper timetable for that, but I would imagine it would have to run to go through Hale village, but you would need to check.
the Pickerings Pastures park apparently shuts in the evening to cars, there will be times on the gates.
there is a pop up café in the park, which appears to open only on Sundays-so that would be nice!
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