Santa has good taste in cameras, but having said that, what you need is to study up on general photography, not so much "Nikon owners R-us"... There are plenty of Nikon sites and forums out there but they talk about the cameras, not so much the actual taking pictures part.
To get better and more even exposures I would suggest shooting in RAW mode. That makes your D60 save a lot more information. Then you can easily adjust the exposure of the sky and the ground either in Nikon's proprietary software (that hopefully Santa included with the camera) or, preferably, Adobe Photoshop.
Good luck and keep shooting!
