Any Dedicated Bike Trails Nearby?

I'm a road cyclist new to Pasadena looking for new trails. Specifically, dedicated trails off-limits to cars.

And as a PI attorney, I wouldn't trust CA drivers with Hot Wheels. More so now, after seeing my own neighbor, a fellow cyclist, get run over a block from where we live.

I usually hit up the trail in Santa Clarita, but that's pretty far.

The LA River bike path is also a decent spot, but still a bit of a drive.

The only other trail I'm familiar with is the one that runs from the Peck Water Conservation Park (El Monte) to Long Beach.

Thanks in advance!