While I wish I could say that I have a great camera and awesome photography skills, I actually used a program called Picasa from Google to touch up the photos. You may be aware of it already but if not, check it out here http://picasa.google.com/
The program is free and you can do some great stuff with pictures. It eliminates the need to use a high dollar camera (for my purposes anyway) with filters, etc.
By the way, is the lower river smooth enough to float safely in a canoe? I have one but don't think I want to try to float the upper river and fish at the same time.