Just to chime in here about riding in and around OC...
As Al mentioned, paved pathways allow class 1 & 2 eBikes. Here's a rough map of the paved paths from the OC parks website:
http://cams.ocgov.com/Web_Publisher_Sam/Agenda07_17_2018_files/images/O00118-000454A.PDF
Fire roads are also allowed, and there happen to be some excellent ones close by:
https://bicyclist.xyz/regulars/electric-age/maple-springs-truck-trail/
Al also mentioned Chino Hills, which is also close by. In fact, you can park at the
Santa Ana River Trail Parking and either ride the SAR trail, or take the short route over to the
Scully Ridge Trailhead which is honestly one of the most amazing rides I've had on two wheels. You'll be out of battery long before you can explore all of Chino Hills.
If you're willing to make short drive to SD you can ride ANYWHERE that's considered part of the city, including Mission Trails! I confirmed this with a ranger just a few days ago. Also, I say 'short' drive here because while it is about an hour or so from OC (depending on where you live obviously), we used to drive much further to get to legal areas to ride dirt bikes.
Keep in mind that the 'paved trail' exception was just enacted last summer. From everything I have read and people I've talked to, it is still very much a work in progress. It is unfortunate to hear some incidents that have raised 'public safety concerns' but I have to wonder if the incident involving the hikers would have happened regardless if the riders had been on eBikes or regular MTBs. Whenever I see hikers I always slow down to about their walking pace and thank them for giving me room to pass. Pandering? Maybe, but if it works...
On a side note, I've never once been harassed by other MTBers but been told to 'get over' and 'slow down' by equestrians when I was already at a complete stop and literally could not move off the trail any further without stepping into the weeds. But hey let's be real, horses don't raise any public safety concerns, leave waste behind, tear up the trails, or allow you to ride long distances...