On the Capitol Limited, you'll see Lake Michigan briefly in Indiana, and, if you are awake late at night, you can see Lake Erie at Sandusky and Cleveland. If you are on the train eastbound when it crosses the bridge over Sandusky Bay, you can look out over the water and see the lights of the world-famous Cedar Point Amusement Park in the distance. Cedar Point can't be missed as its tallest coaster is 420 feet tall. And it has 3 others over 200 feet tall.
In Cleveland, the Amtrak station is right next to Lake Erie.