A little ways outside of the Keweenaw is Bond Falls, a relatively small state park that consists of a parking lot, vault toilets and a decked pathway that circles Bond Falls. I know it's a little out of the way from this site's target region but for those of you heading north from Wisconsin, this one's definitely worth the stop. Not only is is easily accessible, but there's a lot more to see than just what the decks show you. On both the east and west sides of the Ontonagon River are dirt trails that will take up you upstream to other smaller falls and rapids. If you go far enough you'll eventually run into the dam that feeds from the Bond Falls Flowage.
This location makes a for a great day trip, especially if you add in the nearby Agate and O-Kun-De-Kun Falls to your itinerary. On an unrelated note, if you're as big a fan of seafood as I am, I'd recommend making this trip on a Friday afternoon and ending your trip at the Northern Waters Casino in Watersmeet. It's the closest crab buffet to Houghton and alone is worth the drive (it's only on Fridays though).
To get here from Houghton, head west through the yooper loop and onto M-26. Drive for ~38 miles and turn left onto M-26 (if you go straight the road transitions to M-38). Continue for 5.5 miles and turn left onto US-45. Continue 23 miles to Paulding and turn left onto Bond Falls Road. Drive 3.2 miles and the entrance to the parking area will be on your left. There's a big DNR sign here so it's hard to miss.
Thanks to Kelsa Dykehouse for the photo!