Just as the sun wreaks havoc on you and your gear, the saltwater can have a pretty harsh effect too. Luckily, just as you can protect against sun damage you can easily protect for salt. How to protect is based first and foremost on what the gear is. For electronics, we recommend limiting the exposure. Try ziplock bags for this. It will provide a protective barrier while still allowing you to use it.
The best way to protect your gear from salt damage is to simply wash it. Regular maintenance will always win out as the best way to preserve your gear. Giving all your gear a good rinse in freshwater the moment you leave the beach will ensure that the salt buildup causes the least amount of damage.