The sign says no food or drink, but I've always brought in something to drink and they've never said anything. They don't check bags or anything and trash cans are located throughout the facility.
Have your picnic in the park by the lake the Japanese garden is meant for quiet contempation and enjoyment of the beautiful peaceful place
I'm not sure you can bring food into the actual garden but you are allowed to bring food into the park and enjoy a picnic. Shinzen Japanese Garden is located within Woodward Park.
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