Clinton Lake has many miles of good trails. The state park trails are very well maintained by a trail run club, no brush to walk thru = less ticks/chiggers. The corps trails are not as well maintained and get overgrown to a degree so bug spray is advised. Latham trail is 4.5 miles in the woodbrige park corps area on Clinton lake and it has primitive campsites all along it......you can also camp anywhere you want too in woodbrige park. Perry has similar trails, a 30 mile long trail that you can camp on called old military trail, I believe.
The most elevation change on the Clinton trails is on the trails on the south side if the lake. The connector trails go from lake water height to the highest elevation in short distance. there is also a stair/trail at campground 1 south of the rest rooms in Clinton park that has around 100' in a short distance. That's the best your going to get here.
The woodbridge park area at Clinton is a favorite of mine because I can drive there, park, hike in a few miles, on trail or off trail, camp and then get gone in the early am and make it to work the next day. Weekdays it is pretty empty. it is also possible to pack in, camp and the deer hunt nearby at woodbridge and perry but you need to know where the legal hunting areas are. Woodbridge is no hunting. You can also canoe/boat in and camp those spots. There is also free car camping sat woodbridge and douglas county lake. The south end of douglas county lake has some rougher steeper ground but it is mostly bushwhack hiking.