Deer Lake State Park is a Florida State Park located in Santa Rosa Beach, on CR 30A, in northwestern Florida. Its sister park is Grayton Beach State Recreation Area. Recreational Activities The park has such amenities as beaches, birding, fishing, picnicking areas, swimming and wildlife viewing. References External links Deer Lake State Park at Florida State Parks Deer Lake State Park Coastal Dune Lakes Documentary Parks in Walton County, Florida State parks of Florida