Pacific Diner &/or Lighthouse Cafe via PVDrN and Ports of Call

Start at Malaga Cove

PV Dr N
R on Gaffey (this is the halfway point; a good place to regroup.)
L on W. Channel
R on Pacific
L on N. front
R on Harbor
R on Crescent
R on 22nd
L on Pacific
R into Pacific Diner
or R on 39th to Lighthouse

One way distance is about 12.7 miles
Total climb is about 1200 feet (net drop of 100 feet)
Note: I think the climb is overestimated by several hundred feet.