West Hills Park Pavilion in Santee covers 7.5 acres of Mast Boulevard parkland at 8790, combining a large reservable pavilion with athletic fields, a sensory-inclusive playground, and a sand volleyball court operated by the City of Santee. The pavilion structure holds multiple stone picnic tables under a covered roof with adjacent BBQ grills, a configuration that serves birthday parties, family reunions, and community gatherings on the same eastern Mast Boulevard corridor where Cameron Family YMCA runs youth sports programming on Riverwalk Drive. Two fenced play areas separate toddler-scale equipment — including a spring rider, tot-lot slides, and low-profile climbing structures — from larger installations designed for school-age children, with paved sidewalk access meeting ADA stroller and wheelchair requirements throughout. Baseball diamonds and the regulation sand volleyball court handle organized league play and drop-in games, expanding the park's function beyond passive recreation into active athletics. The Mast Park corridor location ties West Hills Park into the broader trail network connecting to Mission Trails Regional Park, and the same sports-equipment demand serves the outdoor retail inventory at Al's Sport Shop on Mission Gorge Road. The pavilion's covered footprint accommodates group reservations for up to approximately 100 guests, with integrated electrical hookups for catering equipment and a dedicated parking lot that handles overflow event traffic on weekends.