Oh, I remember the good 'ole days before I knew how to PP. It is a grand time, the image out of the camera is as good as it gets and you are always satisfied. A very simplistic yet awesome time, photography is all about fun.
Knowing how to PP is essential for perfecting images yet is a double-sided sword, it leaves you trying to analyse all you photos for something better.
When you do want to start, download Gimp, it's freeware.
http://www.gimp.org/downloads/
Start by applying a simple Un-sharp mask to bring out the details.
Then move onto the colour curves, this simply adjusts brightness.
after that you can play with colour saturation / contrast to add some "PoP" to the image.
Another easier option especially if processing sounds a drag, check your in camera parameters for saturation, contrast, sharpness and colourtone. my old 350d lets you create your own settings. If you increase them all by +1 or 2 then it will process them in camera. I did this for quite some time, sometimes it does it better than manually.
Did load a version of your first image, adjusted, but I wasn't happy with the results so removed it.
