As early as you like. It is a great place to walk, run,ride a bike and walk your dogs. You can even buy something to eat. There are great restaurants where you can eat outside and enjoy the lake.
Yes. Its open from sunrise to sunset. I used to jog around the lake and surrounding areas starting at 5am. Especially in our summer months.
Dawn to dusk I think
I'm not sure but it's probably open early we were there pretty early
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