Yup, an oyster shucking knife is a WONDERFUL tool!
Makes a screwdriver look very Luddite...
Oh, don't use a pocket knife or other sort of knife to open oysters - you
will snap the tip of the blade
You can find oyster shucking knives at fishing tackle shops for just a few dollars. Money very well spent!
By the way, can I join you on this oyster crawl of yours?
Alex.