I believe the that leg of the LARIO goes a bit beyond the Maywood Riverfront Park off E. Slauson.
You sure you want to ride this at night? It is not the best demographic in town. "I don't think we're in Newport Coast anymore, Todo." I suspect the safest route is Elsewhere.
I have had no problems on the other side of the river on the LARIO up the Rio Hondo to Peck Rd. Water Park, cross lots to the SGRT, down it to Four Corners by the dam and back over.