There are many recreational activities allowed on, in, and around Lake Perris and in the State Recreation Park. Guided hikes are offered on the trail around the lake, and several camping sites are located near the lake side. The lake is open for boating from 6:00 am to 6:30 pm from Thursday to Monday. Other activities include fishing, picnicking, horse-back riding, swimming (in designated areas), and rock climbing. The park also hosts the annual Big Rock Triathlon at sprint and Olympic distances. There is also a museum on the park grounds.