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To make the simple syrup: In a small bowl, combine the diced cucumber with the sugar. Mix until the cucumber pieces are completely coated. Cover with plastic wrap and refrigerate overnight, or up to 8 hours.
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In a large punch bowl, combine the sliced cucumber, orange, lemon, strawberries, and half of the mint. Pour in the Pimm’s, gin, soda water, and the cucumber simple syrup and stir until combined.
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If serving right away, fill glasses with ice and ladle in the punch (make sure to scoop up a few cucumber and fruit slices). Garnish with the remaining mint and enjoy!
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If preparing ahead of time for a picnic, divide the punch between six sealable mason jars and store in the fridge until ready to leave. Bring ice and mint, for garnish, in a separate sealed jar and divide between drinks right before serving.