They probably went via Po’opo’o Place or Kamahele St., the two alternate backways. They boarded up the Kamahele St. steps and posted signs telling hikers to go away.

https://www.nature.org/ourinitiatives/regions/northamerica/unitedstates/hawaii/explore/lanikai-water-quality.xml

http://tinyurl.com/y6wyxz7b