Rocks, roots, and fields, with real climbing on every pass
The official course description calls this a moderately difficult route through Cleveland Metroparks' Hinckley Reservation, with rocks, roots, and open fields mixed throughout, and about 1,600 feet of elevation gain packed into every loop. That gain compounds with every additional loop the longer distances require, so the Double Marathon in particular asks your legs to handle both more mileage and meaningfully more total climbing than the Half or single Marathon.