The Rock Ministry Burnet invites the community to join in the third “Pick up your cross and follow me walk” on April 13.The walk starts at 8 a.m. at the Seton Hospital in Burnet and continues 9 miles along U.S. 281 to Putters and Gutters in Marble Falls.Two vans to accommodate those who want to walk some and ride some – one is even wheelchair accessible.Pastor Light and the walkers will be…