To my knowledge Campana rock has not seen any climbing. Long arduous approaches and the short climbing season discourage route development. That said, there some real possibilities for a 5.11/12 climber with the serious time needed to develop approaches and clean the rock. The face looks to be 3 to 4 pitches in length.
I've approached the largest rock face via a grueling direct approach from the bottom in 2006. In 2009 I've also attempted to approach the rock from the top via the ridgeline leading from the transmitter towers located at the top of the park. A series of intermediate steep hills and dense vegetation along the sides forced us to abort.
If you have the time and the skill to develop this area let me know I will share my topos, GPS, track logs, and pics with you.
Park entrance: N8 42.740 W79 52.790
Campana Rock: N8 40.316 W79 53.421
Parking for bottom approach: N8 40.974 W79 53.298
Excellent swimhole: N8 40.676 W79 53.694
Finca Martinez ranch: N8 39.916 W79 54.083
Tower (for top approach) N8 39.974 W79 55.556