My experience living in Eugene, near campus, spoiled me for any other city, training-wise. I was less than a half-mile from the SEHS track, meaning I was 1km from the Amazon bark trail (mile loop with lights on til 10pm), meaning I was 1.5 miles from the Rexius bark trail (3.5-mile loop), meaning I was 3.5 miles (2.5 of it being bark) from the Ridgeline trail (6+ miles of well-cared-for single-track trail with hills here and there). Not hard to do 20 miles with only 6-7 of those being out-and-back sections--and less than a mile on roads (basically just crossing a few).
Going the other direction it was 1.5 miles to Pre's Trail or the path along the river that has every quarter-mile marked.
Also the running community there means you'll always have a training partner when you need one.
Never needed a car for training. And, contrary to what I'd expect from reading LetsRun, I never had any problems with homeless people, meth-heads, or Alberto Salazar.