Very strange that landscape shots did not come out well, considering that's where the camera excels!.
With regard to showing some samples, the best is that if you have an yahoo account you also get a free flickr account. Upload the images to your flicker account, and then copy the web address (e.g. http://www.flickr.com/cameras/panasonic/dmc-zs3/
) onto this forum so that the members can review your photos and comment.
One possible reason that the photos did not come out well could be due to the wrong selection of the menu. Do you recall the menu option you used or did you use the iAuto mode?
However one thing to remember is that the pictures in the computer can look grainy as that is at full size, and most photos you see on the web are where people have made the photos smaller so you will not notice the grain. If you were to convert the photos to smaller prints they actually may look great!