I think it depends on the reel. Some freshwater reels can deal with the salt better than others. Make sure there are no magnesium parts. And I would be sure and spray it gently with freshwater after every outing and clean and oil it when you get back.
If it was a spinning reel you wouldn't have as much of a problem, but baitcasters seem a bit more sensitive to salt if they are not made for it. I'd be more apt to bringing a heavier spinning reel if you have one instead of the baitcaster.
Have fun.
-D
