This race takes place at Mission Trails Regional Park located in Santee. There are two main climbs in this race, and the climb that names this race the Stairway to Heaven is Mt. Fortuna with steep stairs made of railroad ties and rocks. Another factor that always makes this race difficult is the August heat. Overall, I think this race was a little too extreme for me after my knee surgeries, but I definitely think I could just take my time and hike these great trails.
Mission Trails Regional Park has many, many trails for every level of hiker and runner. I recommend this park for a day outdoors. Here is the LINK for more information about this park.