True - Nikon has got lower noise problems than Canon... that is one of the reasons why Nikon is favourite brand of all landscape photographers ;)...
Some tips, I don't now really - You have to shoot in lowest possible iso - but You know that already. In post processing avoid strong sharpening - if You have to - use smallest possible size and masking, avoid sharpening of sky, water and darker areas, where the noise is most visible. Noise reduction tools are always helpful - You can use build in noise reduction in Camera RAW if You use - if not I reccomend it. Not to much, because You will loose the details, everything here must be done really gentle here.
If You are shooting in low light conditions - use lowest iso, longer times and always tripod.
I had Canon 600D before and I remember noise were always a problem. In future, when You switch to FF camera - You will feel the gigantic difference! Worth it! Now shooting the night sky northlights, with iso2000, few seconds of exposure - is not a problem.
Thanks man. I will be working hard for my FF dreams then haha.