I love sealife centres. Bournemouth Aquarium isn’t the biggest I’ve seen, but it’s not bad. It’s hopeless for taking pictures with a compact camera – it’s dark and the creatures are mostly in motion, but I managed to snap a few on a trip this August. Mostly things that weren’t moving!
Here’s the link to The Oceanarium (as they call it) – although it’s a bit commercial and child-orientated for my taste.