Usually I have my ISO set low while outside unless I'm capturing 'action' - like at a swimming match, or kids riding their bikes, or at a baseball game. Use your flash outside, it will help fill in the shadows that occur in bright light. And, depending on whether you want your background behind your subject blurry or not, depends on what you set your aperture at. A lower aperture means more blurr, a larger aperture means LESS blurr.
For example: the picture I took of the screw on the desk was done with a 200 ISO, 2.2f (aperture) zoomed a little with macro on, no flash. (of course, with Macro, you can't/shouldn't use the flash typically - it will make the pic WAY too bright.