Wear comfortable shoes, and if it's been wet, nothing you want to get muddy. The path is paved all around (3.5 miles I believe the whole circle), but... Getting from the Hemlock parking lot to the main walkway, you have to go down a sloped dirt path.
Also, to address a couple of the negative comments, YES, no wheels! You don't have to worry about being run over by bicycles or rollerbladers. That's a GOOD thing. If you want to ride, go elsewhere. And it is a long way around with no shortcuts. If you can't make it, go a quarter way and turn around. There's no rule you have to go one way. One thing that remains a negative is the lack of sanitary facilities, so go before you go.
They also don't want you to feed the geese. It disrupts their natural migrations. Plus, feeding them means you'll have to sidestep the little green goose turds that will be everywhere.
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