Boeshield. Wax your paint with a good carnuba wax or even better - Butcher's Bowling Alley Wax. Then Boeshield everything else,. Occasionally rinse the salt, wax again, boeshield again. For your rims, after you apply the boeshield, swipe the brake surfaces with denatured alcohol.
I take very valuable fishing reels to the salt water, and am a metallurgist and corrosion engineer with a PE license.