You could take the train the Bristol Temple Meads and cycle out via the Bristol Bath Cyclepath or make it into a weekend staying in the centre of Bristol.
You will also see 3 and 4. These are not the Avon Cycleway but where the long distance routes use this route.
The route though (In 2021) was very well marked and thank you to those that do this. Sticky signs are frequent (see bollards below) and even the new diversion in 2021 around house building in Larence Weston had new signage.
The perfect one is the 410/Avon Cycleway.