Pooks, I live rurally, but I still need to put my bike on the bike rack and drive to where I cycle. I live on top of a small mountain, and one would think oh wow, lots of hill training, but even though it is the 21st century my rural area has a lot of gravel roads that are very steep and the road bike can't go over such roads.
I park at a nice state park out in the valley, about a 20 minute drive for me. There are nice restroom facilities and water faucets. The rangers patrol the park so I don't have to worry about my car getting broken into while I am gone. Where I park is popular with the cyclists and when I park I can tell instantly if anyone is out cycling that day or not. This park is a popular place to start a daily ride for my category of cyclist, which is the long distance soloist fitness/fun cyclist.
There are trails inside the park, which are good for those riding hybrids and who cycle at a slower pace. However if you are on a road bike like me, you want the road, and you want the miles, therefore my daily rides are out of the park and the park is just used to unload and load and use the restroom facilities.
I used Mapquest to figure out my routes. I know my starting point, and from there I can zoom in and go in all directions, seeing where roads go, how I can make loops, and how I can make larger loops, and how I can make loops within loops.
I am like others on this thread in that I stay off of the busy roads. However there are stretches of some rural highways that don't get too much traffic, and those roads are ok to cycle. You learn these tricks by observation on your rides.
I developed routes that enable me to circle back to my car if the wind or rain gets too fierce, or if I feel fatigued. So I have routes that can expand or contract, because once I get on the saddle and get going, unless I have a serious time constraint, I might have intended to only bike 30 miles but I can veer off at certain points and actually do 40,50 or 60 miles if I am really feeling the joy.
I realize you will be an urban rider, which will be different types of rides. When I was younger I lived in San Francisco and there was a book titled something like "Bicycling the Back Streets of San Francisco." That book gave a lot of routes, and I learned how to cut through the Golden Gate Park, and go through the Presidio and get on the Golden Gate Bridge to bike over to Sausalito - all on my heavy steel road bike. I remembered I biked near where Alioto lived, the guy who eventually became a mayor, or maybe it was his son who became a major; he wasn't a mayor when I lived in SF. I biked all of the routes in the book, then took off from there, because this was back before the internet and Mapquest. It has to be the same in your city, bike routes developed for the back non-busy streets that may not be designated bike lanes, but will let you pedal for miles and miles without being on a busy boulevard. If you can find that book for your city, even if it is out-of-print, then you can start with the routes described in the book and after you learn those routes, go off and figure out some on your own by using Mapquest.
Darcy