I'd say, if you are looking for some awesome trails in Missouri try Klondike County Park, on South Hwy. 94 near Defiance. 4 trails that range in difficulty from novice to hard. The easiest to find are Hogsback Trail, Donkey Kong loop, and Strip Mine Loop. Hogsback is the longest of the trails and is what i would consider novice, lots of singletrack some switchbacks, a double switchbacks, tight confines with trees, some rock mostly dirt and a fair amount of roots, the only real climbing is getting up to, a steep asphault path and then a steep ascent through woods, has a good fun factor. Donkey Kong Loop is the shortest, I trudged my way through that one very rocky, and turny, the best thing about Donkey Kong was the great views., DK was about a mid difficulty, and Strip Mine being the hardest has a big rock step down, and some really cool terrain, i didn't ride it, cause it was above my ability, but i walked a little bit of it and it was pretty narly, that stepdown was awesome, eventually i'll ride it. Donkey Kong Loop and Strip Mine Loop are all fed off of Powerline Trail, which is sandy and really wide, it gets you to the fun trails. And one last trail i discovered on accident was Donjo's Trail, i amde a wrong turn on Powerline and was cruising down hill, and saw a sign in the thickett and decided to investigate, Donjo was fun, singletrack lots of dirt, more technical than Hogsback and shorter too, and it takes you back to the Shower house for camping.
That brings me to the park itself, it's nice. Camping spots from bare to better, and you can rent cabins, theres a shower house, playgrounds, paved walking and biking paths and a lake in the middle of the park you can fish in and the coolest part about the lake is it's surrounded by white sand. The best part of the park by far is the overlook bluff. It looks out over the river, farmfields and a coal power plant.
Definately worth checking out. It's on Hwy. 94 about 15 minutes south of Hwy. 40/61 theres a big sign on the left side of the road that you can't miss.