The Santa Maria is a replica of Columbus's flagship. It is docked in the river and absolutely a must see.
The tours onboard are guided and very family friendly. You have a chance to use navigation tools like Columbus would have used and play games like the sailors would have played to pass the time. Its a living history tour, so people are dressed up and playing the part. The tours last about 45 mintues and you get to explore the ship with your guide. It is very hands on and cool.
We stopped off in Columbus on our way to Pittsburgh from Kansas. It was a perfect place to get out stretch, learn something, and regroup. Battelle Riverfront Park is right off the ship and we had a great picnic lunch and ran around before getting back into the car to jouney on. It was a great two hour stop and we'll do it again.