Eric E.
Yelp
This is based on visiting over two days, but not camping.
The trails at Palisades can be steep, but the lookouts are beautiful with great views of the Mississippi River and many preserve islands. Highway 84 and a much used rail line run along the Mississippi River, between the river and bluffs, so this can make it a little loud, but from some of the lookouts, still has the mystique of long trains winding along a majestic river.
So... the trails! Most in the south of the park can be somewhat steep, but very manageable if you don't have mobility limitations. There are some beautiful trails, running along ravines, and under canopies leaves, and a moderate bug population. Not the most buggy of places we've hiked, but repellent is advised. One of the trails, Sunset, offers a moderate to challenging loop, but has a huge variety of terrain to make things interesting - in a good way.
The northern trail set is mixed. Trails, such as High Point, are pretty much a gravel road through beautiful forest, ending at a shelter and fantastic lookout. There is a short trail to a rock outcropping, which offers amazing views, but USE CAUTION as it is at the edge of a drop-off. Other trails, such as Bittersweet, can be downright challenging, especially if it recently rained.
Both sets of trails can keep hikers busy for a weekend, but pick and choose what you want to do! Not much flat space outside some of the camp space, so I hope you like hills!
Objective word on the campsite layout - it looks like there is a fair amount of space between most campsites. Some can be grouped together (great if you know the folks in the next site), but most seem to have ample separation. Some of the tent sites look like they're actually nicely tucked away from the road, which is our preference. We'll have to come back some time to try camping, probably in the fall. Yes, as others have noted, the highway and rail line is not far away, but overall, it looks attractive.