The Hoosier National Forest is made up of several seperate districts. The one Catrin is referencing (Brownstown) is well north of the one surrounding Derby. Brown County State Park is over 2 hours away.
I would go directly to the Forest's website if you're interested in MTBing, along with HMBA's website. There is a 24-mile trail near Derby called German Ridge that might appeal to you. I can't help you with road riding there, as I've not ridden in that part of Indiana. I'm guessing there's at least one bike shop in nearby Tell City that could help you with road routes though. Shops in Evansville might be of some help, too.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher