A.A. Milne’s picnics in Winnie-the-Pooh (1926) are happy and leisurely held in “The Hundred Aker Wood.” It’s a location just above the “Sandy Pit where Roo Plays” with a sign that says “a Nice Place for Piknicks.” No doubt, where Christopher Robin holds a formal picnic party for which Pooh agrees to attend because pink “little cake things” will be served.
A less formal picnic simply has Christopher Robin, Pooh, and Piglet happily spread out on a blanket. There is a honey pot in front of Pooh.
See A.A. Milne. The World of Pooh; The Complete Winnie-the-Pooh and the House at Pooh Corner. With decorations and new illustrations in color by E. H. Shepard. New York: E.P. Dutton, 1957.