There is a surprisingly wide range of trails in this park for a rather small area. It can be divided roughly into 2 sections: the western side with the Powerline, Strip Mine, Donjo's, and Donkey Kong trails; and the eastern side with the Hogsback trail. Both of these sections can be ridden as a complete loop by making use of some of the paved and gravel bike paths in the park. (pasted from gorctrails.com)
The trails on the western side are for the most part, rockier and more technical, featuring the flowy, curvy Powerline trail, and the advanced, uber-technical Strip Mine and Donkey Kong trails. Nearly everyone will end up putting a foot down, or even walking some sections of these trails. They are not recommended for beginners, but will prove a challenging and rewarding ride for more skilled bike handlers. The newest addition to this side of the park is Donjo's trail, which makes use of some major rock-work and steep cuts into the side slope to allow a more gradual elevation change in reaching the Strip Mine trail from the Powerline.
Klondike - Donkey Kong Trail
On the eastern side, the Hogsback will take you on a thrilling ride beginning on top of the bluffs, and sending you rapidly down a screaming descent with super-tight switchbacks, a 40 ft. sandstone ledge, exposed slopes and even some short but tough climbing near the bottom.
Because of the sandy, rocky soil on the western side, these trails generally drain well, and can be ridden fairly soon after rain. The Hogsback, however, is on a north-facing slope and the lower areas see little sun and are very slow to dry. It can be very muddy and slippery, so it's recommended to avoid it immediately after rain.