I too live on the coast and face this problem. I hose the bike off after every ride, I grease my cables (pull them and lube them), I use wax on the chain because it doesn't wash off or grab sand as easy as most lubes, I use silicon spray w/teflon on the shifters and DR;s, definitely wax the exposed parts of all cables, and learn to live with a little rust on some of the bolts holding everything together. Good luck and don't forget to polish the frame on a regular basis.