One of the key ways to take great photographs is to take lots and lots of them, so buy a large memory card that can hold them all. By increasing the size of the memory card that you use in your camera, you are increasing the number of photos that you can take before changing cards. A large card will also allow you to use RAW format so you can take advantage of the additional flexibility it offers.
Play with the shutter speed on your camera to catch unique and wonderful photos. If you have the right shutter speed, you can get beautiful photos that would normally happen so fast that the human eye couldn't process it fully. Try experimenting with shutter speed and a tripod at a stream or waterfall for some great photos.