Hope i can help u out here.
Mars2005,
What camera are u using?
1) Set ur saturation to +, crank it up and see the results. U will soon know when its nice to have it max and when to have it to 0. For most scenery/outdoor pics u (usually) want it ++++.
2) Play with the WB. Auto isn't perfect.
3) PP is quite necesarry if u r posting it online. Reso and added sharpening is usually needed.
4) Pick non dull background/lighting. Flat blue sky will look like flat blue sky. Morning to have clear effect. Evening for warm effect. (not always) Best times are sunset and sunrises, although its hard to catch a good 1.
5) Your camera is not holding u back. Its the photographer not the camera. Camera companies will always tell u that your camera is inferior but it isn't.
6) Most cameras tend to overexpose. Usually -2/3 or -1/3 does the trick. Flat indoors usually require 0.
7) Please ignore single channel histograms. If u wanna use histograms, make sure its a three channel RGB histogram.
8) Overexposing will blow out all your highlights which cannot be recovered. Underexposing can (usually) be saved with editing.
I think the most important thing to get great colors is to look for colorful things to shoot. Easy as that. Lookin for it is the hard part.
Two articles i hope u'll find useful.
How to get great colorsTimingThis article should be particularly useful. It shows how pictures 30mins or so too early can be so crappy compared to the right time.
I hope i din waste anyone's time xD