In a continuation of his father's design philosophy, Olmsted Jr. included passive recreation features such as numerous tiers of paths; a combination of natural and manmade slopes; and the addition of plantings and rock forms to supplement existing features of the park site. The few small flat areas were converted to lawns with trees on their perimeters. Stone retaining walls were placed along slopes to prevent visitors on the paths from falling off the cliffs. The park also included curved drives and pathways for vehicles and pedestrians, as well as segregated vehicle and pedestrian uses. Other design features in Fort Tryon Park included the use of arches; segregation of passive and active recreational activities; the diversity and precise arrangement of plantings; the variety of different landscape designs; and the blend of naturalistic and architectural features. Similar design principles were also included in Morningside Park and in the Ramble at Central Park, both designed by Olmsted's father upon steep terrain.