Frenchman's Flat Day Use Area offers a popular access point to Piru Creek with a 60-space parking lot, vault toilets, picnic tables, and a non-motorized paved trail (Old Highway 99) for walking and bicycling.

The site experiences high use during peak season (April-October), particularly on weekends when parking often exceeds capacity, with overflow parking available on roadside shoulders.

Swimming, fishing, and dispersed picnicking are primary activities, though camping is discouraged and the access road to the day use area is currently closed to vehicle traffic, requiring visitors to hike or bike in.