Congrats on your new baby! I got mine just over a year ago and love it.
After using my PA in the salt, the mirage drive gets a good rinsing, of course. I then coat all metal parts with Breakfree CLP, as recommended by Hobie Kayak guru Roadrunner. Breakfree washes off pretty fast, but has the advantage of not gumming up over time like WD-40. After a year's use in the salt, my mirage drive looks like new.
One other thing worth mentioning: Despite doing a thorough washdown after every trip, some salt aways seems to stick under the seat area. A few times a season I also remove the seat and do a good cleaning and lube to protect the of the hardware under there.