The US is a BIG place... I would start 'Local'... LOL!
I would start by checking for a Bike map for your area. Sant Barbara County has such a map, available both online and paper at many locations in our area.
I believe the are a number of maps for the Greater Hell-A area... Quite possible many other bike friendly cities/areas have same.
Also go ask your local LBS's
Check for local bike clubs, organizations...
go to a close bike route, wait for a rider to come by, one who looks like they know where they're goin,,, you can ask them or follow them at 30 - 40 yds for half the distance you want to ride....
At that point you should know that 'return' route...
The internet has a ton resources...
As an aside... To Mods, if BF doesn't already have a repository, it would be worthwhile to have a 'Forum' or obvious location for BF members to post/place/note Bike Maps ! for anywhere in the world. ... seems an obvious and important asset ...
Ride On
Yuri