I read your additional details, and then I did what I should have done before replying the first time. I looked up the NRS Desparado boots, and after seeing exactly what they are, I deleted my earlier reply because now it's clear to me that your boots are just a really bad choice for a person who's feet tend to get cold easily. In my deleted post I said that I have trouble with cold hands and feet too, but I'll add that wet neoprene is the very worst possible thing to have on my hands. In neoprene gloves my hands will become numb and useless in just a few minutes if it's raining and 45 degrees, but wool gloves in the same soaking-wet situation will keep my hands warm even below freezing. That's how terrible wet neoprene is for my hands, and I bet it's doing the same thing to your feet. Ditch the neoprene wet shoes and get some decent waterproof boots and good socks (I prefer wool, but with a synthetic liner sock so I don't have to wash the wool socks as often).
For your use, I'd recommend against the floppy, sock-like boots that most kayakers wear, and get something with a decent sole and laces or straps to cinch them tight around your ankles and instep. They'll be far more versatile. I never hesitate to walk a few miles in my lace-up Chota boots, but sure wouldn't do so in a loose and flimsy kayaking boot. Such boots are expensive though, and a cheap alternative that I used for several years is knee-high "Tingley" boots (available at any store that sells work clothes) over regular lightweight hiking shoes (again with synthetic and wool socks).
If your foot-warmth problems turn out to be too severe to cure with proper boots and socks, you can get chemical warming packs shaped to fit under the balls of your feet. I've never tried them, but the basic square heat packs put out a surprising amount of heat, for a few hours. I'd be really surprised to find the boot-warmers for sale in Louisiana (like trying to buy "real" winter clothing in Florida), but you can order them online from any sporting-good store.
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