Nothing really exotic, but I had ray once. It was in strings, like fishy chewy spaghetti; two layers separated by a solid array of what looked like finger bones made out of cartlidge. Not that nice really, tasted like fish but texture was off-putting.
Also had elk aka moose. That was delicious, and tasted a lot like the venison rump I had recently from Welsh red deer. Much less gamey than I was expecting.
Not at all exotic for most people but I had a slice of raw salmon fresh from the sea, seasoned with dill and salt. Tasted great but really turned my stomach.