In case you don’t think you need a flash, here’s a quick little post that might help you see why you do.
I shot this flower at the Portland Rose Garden while leading the Scott Kelby Photowalk last weekend.
It was a sunny day, late morning and the light was harsh. I looked for flowers I could shoot in open shade to reduce the impact of the harsh sun. The first photo is made with no flash, using the shot the camera suggested while in Aperture Priority Mode. The second shot is made using the same settings, only I added fill from a Nikon SB-900 using a Ray Flash Ring Flash Adapter. Notice the more vibrant detail and color?
You may not actually NEED a flash, but it sure helps in situations like this if you want to get a photo with lots of impact, right out of the camera.