I find towpaths annoying, great in the morning but take your time in the evening,ok for ambling along and getting a grip on the ride.
The annoying road cyclist will appear flat out, I am a road biker too,you will soon prefer the roads.
+1 on the roads vs towpaths, Have a look on google maps and use smaller/quieter off roads if wanting to get use to it , It is also a good excuse and safer way to practice hand signals and balance with or without traffic.