That's a problem. I found two solutions: First, there's a vacant area of unused woods nearby that's perfect for vagrants, criminals, and mountain biking! There's a few old fire roads going through the woods and several opportunities for some singletrack trails. Probably 2-3 miles with some looping around. And it's less than half a mile from my house.
Second solution involves a bicycle rack for my motorcycle. At least that way I'm technically car free even if I still have to rely on internal combustion occasionally.
Az