A group of us have been riding Hoosier National every weekend since the end of February.
The Hickory Ridge trail system is becoming my new favorite trail system in Indiana. The Raw,Rugged ,mostly un-maintained trails and Brutal climbs, kick our butt every time we ride. 20 miles in there feels like 40 anywhere else.
I don't want to dissuade a trip to Versailles, it is an excellent trail system with the same type of high speed flow as brown county,
it is however about an 1hr 45min from BCSP, for a change of pace I too recommend the hoosier national forest, valley branch or gnawbone camp. All are within 10 miles of BCSP, All have steep climbs and descents and are more rugged than brown county. If legs are a bit spent, after 2 days at bcsp, nebo in hnf is close by, doesn't have too much climbing, and is an out and back for 17 miles total, so it would be hard to get lost. If you want more, it's a short jaunt to hook into the hickory ridge trail system.