What indeed?

I am unable to figure what is best for the items below, your help is welcome:

"once in a while" or "once in awhile"
If both are OK, is there any difference in the meaning?

And giving directions, I am lost between:
"...take Maple Street on your left"
"...take Maple Street to your left"
or
"...make a left on Maple Street"
"...make a left to Maple Street"

Thank you very much, have a good day/week-end.

Once in a while. (If "while" can be parsed as a noun, then do so.) Maple Street, on your left (assuming starting location is correctly noted). Maple Street, to your left (assuming etc.) Make a left [turn] on[to] Maple Street. All above are correct. Incorrect: "Left to Maple Street." This is correct only if there is some intervening information not stated here. (E.g., left on Bumpy Road to Maple Street, then hang a right.) SS