For a fun experience, like Tom Sawyer, there's the Dorena-Hickman Ferry that across the Mississippi River between, oddly enough, Dorena, MO and Hickman, KY. Missouri and Kentucky are the only two border states in the US that aren't directly connected by a road (because you need to know important stuff like that). It crosses the Mississippi about 75 miles south of the two Cairo, IL bridges at Wycliff, KY, and about 75 miles north of the I-155 bridge west of Dyersburg, TN.
It crosses the river 7 days a week during the daylight hours. About $16 for a car, straight trucks is $32. If you ever go back across the other way, and you still have your crossing ticket, the return trip is half off. No expiration date on the return. I've been across that thing so many times I can't even count.
It's an on-demand ferry, very laid back, where if the ferry isn't at the landing when you get there, there's a telephone pole with a button on it that you push, like at a crosswalk, that will summon the ferry. The trip across is about 15 or 20 minutes. The ferry has several high class amenities, like a railing so you don't fall overboard, a port-a-potty so you don't have to pee overboard, and a soft drink vending machine.
It'll hold a tractor-trailer and a Mini Cooper.
The Call Button