by 
Tidyup
ANSWERS: 4
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No it does not because a day' cannot visit anything. Yet it may if it is implied that an implicit pronoun corresponds to the direct object that is doing the day's visiting.
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Yes. Randy's bike means "The bike of Randy" "a day's visit" means "The visit of a [particular] day" If it were "a days visit", "days" would be the *plural* of "day": it doesn't work at all: "a", singular, doesn't go with "days", plural, and then "visit" is left over.
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It's now days end. Day's ended now. Its sense is uncertain. It's surely a curtain. (I think they are all OK.)
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It does. just like "a year's pay" or "this month's rent."
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