Rock-it trail is a long singletrack that will be enjoyed by most riders. It is a good mix of fast and rocky sections. Definitely a must when tackling singletracks at Aliso.
Bounded to the South by a private beachfront community that blocks bike access for several miles, Doheny has a long bike trail along the sandy beach, some of which is car-free.
Aliso and Wood Canyons Wilderness Park includes over 4,500 acres of untouched wilderness and natural areas. A lot of the "roads" in the park are smooth double-track paths, and there is a fair bit of singletrack as well.