We family adventured to the Omaha NE area last weekend and would up finding a great walking path, a very cool park and a great state recreation center.
If you ever get a chance to visit Ak-Sar-Ben Aquarium and OutdoorEducationCenter— DO IT. It is extremely inexpensive (our family of 5 got change back from a FIVE). The opportunities there are amazing. They have a education room of live turtles, frog and salamanders. There is an area for the children to handle and interact with painted turtles (what i grew up calling box-turtles). Staff are frequently available in the encounter room for the children to talk to and even to facilitate the children getting to touch some of the animals. We got to feel the shell of a soft-shelled turtle. They also have many empty shells, animal horn, animal antlers and pelts for the children to handle and interact with. There is also a large aquarium.