Hey Brent... Depending on distance you want to ride, you could do a loop starting at South Trail Head... Basic loop starting at lake trail ending with quarry and johnson is about 18 miles. I like to start at Toads (next to south trail head), and do family, rattlesnake to lake and then cross road to to seven bridges which will take you by the pump track and then on to North Trail head. After you climb red road, there are some technical options... Boulder Ridge (very technical with boulders) to the right (ends at beginning of west ridge) and West Ridge (technical but not as technical) on down a bit to the left. Or... you can continue on the red road (fire road) to bump connector. West Ridge comes out to bump connector which takes you to blood rock (quarry) left or jeckyll and hyde - right. Jeckyll and Hyde begins with 1st half being technical rocks and 2nd half is flowy and fast. This trail will come out at Toads, which will take you back to parking lot. If you take quarry, you can then do johnson to foreplay and toads. Lots of options and you can get in about 25-29 miles with all the trails.
Those trails I mentioned make up the loop with some options... If you like fast... When you get to Garret's Gulch on the boy scout road, you could try out the flow trail, lightening. Let me know if you have questions! Hope this helps!
Map... http://bump.org/wp-content/uploads/2012/12/2012omsp_map.jpg - red trails are mountain bike...