Two Trail Council volunteers and three CSUCI students met at the Sycamore Cyn Day Use Parking area and carpooled into the park to begin hiking at the Serrano Cyn TH for an excursion around Serrano Valley with a break at the Serrano Homesite. Six signs from the 2007 installation project were surveyed, one of which was found to be missing. We determined that four new signs would be beneficial in Serrano Valley and found three signs (two unreadable) that were not included in the 2007 package. We also found that the Harrison map and State Park GIS data do not reflect the obvious, well used path between the southern terminus of the Serrano Valley Loop Trail and the Serrano Homesite. The main route in this section is clearly delineated in apps (Gaia, Alltrails) based on OpenStreetMap data