This past week, we traveled up to Newport, Kentucky, near Cincinnati, and visited the Newport Aquarium. At only $23 per adult and $15 per child, it's a reasonably priced day out.
The aquarium has all kinds of different sea life to look at and they even have a touch tanks with multiple types of sharks! While we were there, we were even lucky enough to watch a shark lay an egg.
We spent about 3 hours at the aquarium, so I definitely think we got our money worth. We easily could have spent even longer there, but we had other plans for the afternoon.
The aquarium also has a small restaurant, so you don't even need to leave for lunch if you don't want. But if you do plan on leaving, I highly recommend walking over to Tom + Chee which is around the corner from the aquarium. Their food is delicious!