from my memory of walking the VF last year and with very slight vertigo problems, I don't remember any sections giving me trouble. however, there were some beautiful paths over steep slopes or with drops on one side.
don't be alarmed at the long list below! these are only potentially problematic sections for which it might be good to have an alternative ready in case of problems.
looking out for the blue bicycle VF path is always a good alternative to the paths, especially in the aosta valley and across the Apennines. I think there are no distinctions in Tuscany where VF follows mainly gravel roads?
almost all of the VF in Tuscany is on the google video.
- going down from GSB pass, the section after La Cantine to the main road descended a beautiful panoramic path over steep slopes
- the descent from Etroubles to Aosta (the one kazrobbo is talking about) was mainly in woods, although the slopes were steep, but the path was wide and only occasionally going very steeply down - there parts were mostly on pastures around villages, especially into and out of Gignod
- between Chambave and Chatillon the path runs often across steep pastures between (abandoned) villages, I loved it
- the second part of the section between Reclou and Verres is a narrow path through scarce woods often on top of a cliff and the descent is a steep knee-killer on a slippery stone-paved road
- the upper route between Donnas and Pont-Saint-Martin (official VF side has now only the lower route along the main road which was not particularly well waymarked last year) along a minor road across steep slopes
- a short section after Pont-Saint-Martin going up to Carema was a lovely panoramic path
- there are ditch sections along canals across the Po plain if that might pose a problem
- the climb to Cassio has open (steep) path sections between Case Storti and Casola-Villa, otherwise it's in the woods
- perhaps avoid the path over Monte Marino by taking the road - that's just before Berceto
- the upper path via Monte Valoria is surely beautifully panoramic (I was in a cloud up there but I believe the photos I've seen) but there are steep slopes on the left - take the waymarked alternative via ostello and up the road
- the descent from the Cisa Pass to Pontremoli was one of the most beautiful sections of the entire VF, imo, but it is panoramic at times
- the path down from the Cisa Pass to the Passo Righetto is in steep woods
- the path from Passo Righetto down to the bottom is steep and on a beautiful panoramic ridge in the upper part, then down a steep stony road, then down some very steep meadows, and there is the suspension bridge at the bottom - but there is be a ?waymarked '
historic alternative' which goes via Montelungo Terme
- the upper part of the path into Bibola is across a partly exposed ridge - take the forest road for the last short section
- the descent from Ponzano Superiore to Aulla has some steep exposed paths, but not much
- the section from Avenza to Massa is up on the steep hillside between vineyards but it's a gravel/tarmac road
- especially the first encounter with the rolling hills of Tuscany (not very gently rolling, mind you) is quite panoramic but the slopes are not steep (except those you have to climb, of course)
- the path up to and down from Radicofani can be sometimes exposed, but it's mostly on a wide lane or a road
- do take a look over the panoramic lake from Montefiascone, you are safely behind a wall
- I don't remember any problematic sections (except for the lack of waymarks on the most critical part - see my notes in the accommodation list) on the alternative via Ronciglione
- throughout there are sometimes more exposed short sections going into or our of the hilltop-perched villages