For drying it out, try either standing it upright (if you have the head room in the garage...) The water will drain down with gravity. Also try unzipping the bag when you get home. I definitely would not take the board out to dry ! Unless you have a safe place for it, and you like looking at it

Most of the boards are epoxy, and the epoxy is probably off-gassing for a fair period of time, and the board bag would trap it. My Tropical Blends does have a bit of a resin-epoxy smell coming out when I open the bag... it's that "new board smell".... a variation on the "new car smell"

Also, watch out for too much salt water on steel zip heads.... It can make the zips freeze up. Try WD40 / or Silicone Based Motorcycle Chain Lube. Worst case on an old bag with a stuffed zip, try cutting the zip out, and hand stitching in a couple of velcro taps.