Simi Bike Trail is a 11.2 mile out and back trail located near Simi Valley, CA. The trail is good for all skill levels and primarily used for road biking.
Nice and flat trail, easy to ride
From Yosemite Ave to Madera Ave and back, the Arroyo path is about 18 miles round trip. There are a few good sized hills, but the path is mostly flat. There is very little shade, so I do not recommend doing the whole thing on a hot day. The bike path is great for all fitness levels. Perfect for walking, running, biking, skating, whatever! Especially great for walking/running with a stroller.