Reply to "take a walk"

Hi David,

Are these sentences  correct?

1. "I need some exercise. I think I'll go to  walk a mile."

2. "I need some exercise. I think I'll go to walk."

3. Let's go to shop/ hike/ fish.

4. Let's go to shop in the store.

5. I am going to go to hike in the woods tomorrow morning.

 

Thank you very much for your great help.

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