OwO I'm not alone on this one. Sometimes I love just sitting there and listening to the soothing music. I like walking up to the tanks and hearing the sound of running water in combination with the calming music and i might even use it to go to sleep if I feel anxious.
I can't stand the art section, though. The music drives me mad for some reason, so when I go in it, I mute the sound.
I used to like the fossil room too in the gcn just not so much in acnl. It sounds like the some part were removed.
Fish roooom!! It's always been my favorite since I first started playing back in Wild World! I mean I do love fish so it's fitting. I like how they interact with you too! How the Moray Eel comes out all angry when you're by it, or how the piranha tries to bite ya. Its cute.
In fact if I had to rate them, it would go:
Fish
Bugs
Fossils
Art
Not to say that Art is a bad room, but I've just never gotten it filled up enough for it to be genuinely interesting. I do like to look at it every so often.