To sum up what Jeff Hardy said, in the map window, click the little peep icon. Then place the square on the edge of the land with the arrow pointing towards the center of the park. That'll be the spot where the peeps will enter your land at. You can place up to two of those squares. Also make sure your path way is sitts on that same square, and make sure the path way between the edge and the gate is not owned land.
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Is it May yet??