Best circulation I've found without A/C that works pretty darned well:

Start out with all windows closed.
Crack the right two windows about 1-2 inches. This causes a "whirlwind" effect inside the car, good driver's side breeze and the noise level isn't bad at all. Want more breeze? Crack the back-right window down a bit, leave the front right window alone.

If you have a moonroof, substitute the moonroof for the front-right window.