I ride alone all the time. I join the bike path in the area about a mile east of the I-285 overpass,between Clarkston and Scottdale. Sometimes I ride into Avondale and do a few laps around the lake, then head out to Stone Mtn. Never had a problem other than the "locals" like walking 3 to 5 abreast so they're blocking the path in the Clarkston area. Sometimes they'll move over when they hear "on your left" or "excuse me" or the click of my shifters as I slow down to pass them.
Must be a long ride for you. I see your location says Alaska.