Yeah. It's got a few good day hikes (well, good for the mid-west... doesn't compare in difficulty to stuff in the Rockies). It hasn't really changed in 20 years. Tends to get packed on the weekends... one of the more popular parks outside Chicago, for sure.If you are taking 80 across from Chicago, Starved Rock State Park is worth a visit. I grew up near there and haven't been in over 20 years, but I remember it being pretty cool.
If you're stopping at Starved Rock for a full day (or two) my kids really like Mattheissen SP, which is only a few minutes away from it. No camping there but you can hike down into the canyon and through the river to the waterfall at the end. Again very cool for the mid-west, but if you've hiked the Narrows at Zion you'll probably be disappointed
(If anyone needs ideas of places to stop when heading out I-80 feel free to PM me)