Characteristic of point-and-shoots, photos are best in bright lighting at sensitivities below ISO 200. Grain becomes readily noticeable at ISO 400, but for the most part details remain decent enough for use at 8x10 or smaller sizes. The camera goes up to ISO 1,600, but photos at that setting or even at ISO 800 aren't what we'd consider usable for much more than small prints and Web use.
Heading higher than ISO 200 won't do you any favors. This photo was taken at ISO 400. While good at small sizes, when viewed at 100 percent the edges are softer and you can see noise in the form of off-color specs as well as smoothness from noise suppression.