The crabs are pretty cool. I remember fishing for blue crabs off a wharf in Gulfport,MS when I was a kid back in the 1960s. My dad would get chicken necks from the grocery store and tie one to the middle of what can best be described as a bucket net. Throw it off the wharf, wait a few minutes, pull it back up and see what's in the net.
We used to go to the beach at low tide and look for hermit crabs. That was always fun as a kid.