I've never fished that area, so can't really help you out along those lines, but one thing that can't be stressed enough to new kayakers is to dress for the water temps, not the air temps. If you are prepared for the worst, you will be more likely to survive should that scenario play out. Invest in a pair of neoprene or breathable waders, a quality dry top (like NRS), a wader belt, and a quality PFD. This will keep you floating and somewhat dry should you happen to capsize in cold water and increase your chances of survival.
I also STRONGLY recommend that, after you're properly geared up, you find some quiet water and practice self rescue. This is the art of getting back into your kayak without assistance should you happen to find that you have exited your seat unexpectedly. Practice until you can easily
do it in controlled conditions, and when the real thing happens, you'll be very glad you did.
Here are 2 different methods.