Here are a few tips:
When I go backpacking I can easily take 150 pictures over 5 days. Actually, I could take more if I had the memory for it. But the problem is that when you get home you may not remember what your pictures are of. So I bring my palm pilot and take notes for every picture I shoot. That way when I get home I know that picture 84 is of "Horseshoe Meadow", not "some nice looking meadow somewhere in the wilderness."
Another trick I use is to take mini-panoramas. I used to have a Kodak advantix camera which would let me take pictures in a panorama mode which would give you a picture just as tall as an ordinary picture, but a couple times wider. With my digital camera I take a couple of overlapping pictures and stitch them together in Photoshop using layer masks. If you have Photoshop Elements you can use its panorama stitcher (I don't recall exactly what it is called) to do this for you. You can take these pictures left to right, up and down, or in more of a square shape (that would be up and down and left to right) to get more into the picture than your camera can see. If you use an Olympus Camedia camera (or any other camera with this option) with an Olympus memory card you can use its panorama mode to make sure that all of your pictures use the same exposure settings.
Ansel Adams used to take pictures on top of his car in order to clean up the foreground. If you don't have a car handy you can stand on a rock. However, I often like to kneel down specifically to get as much foreground as I can. I especially like to do this when taking a picture of a meadow, a beach, a dry riverbed, or if I take a picture from inside a river.
Use the viewfinder instead of the camera's display whenever possible. You will save lots of money on batteries this way. However, when you are taking a close-up picture (and you should use your camera's macro mode for this) it is better to use your camera's display because the viewfinder won't give you an accurate view of your subject when doing close-up shots.