We were in Spain recently and went to the sealife centre in Benalmadena. It's not the best sealife centre, not very big, but their main emphasis is on preservation so their tanks are kind of just to show what fish there are in the different environments around the world, rather than a big showy tourist attraction.
Anyway, when we were there it was end of the tourist season so the place was empty. We got to feed the rays and we were the only people in there at the time, so we had all their attention. It was amazing, about 15 or so rays all swimming up to us to take the squid.
They are stunning creatures and we would love to be able to keep some rays. Definitely a plan for future tanks and all your pics just make me want them even more!