This is the huge aquarium place there. Biggest in Europe, UNESCO awards - that kind of thing. For once - it lived up - and 45E and 3 hours later, I felt like we'd had our money's worth - all of us. Sharks, tropical life, even a diver doing some maintenance - all very "Finding Nemo". Our youngest loved the jellyfish - in a large glass tube-type tank, all glowing ultraviolet - very impressive. There's even an outdoor section with seals/sea lions, which you can peek into from out on the beach, which is a nice touch.
I think it's best for families with kids though. It's a very good way of spending time when the weather is less than perfect. Oh, and apparently the restaurant is also very good.