FWIW I think it’s worth riding a few trails in some of the resorts (eg Chatel, Morgin, Champery) rather than just trying to hit the whole 80k circuit. Note I like the PPdS and am doing it for third time this year but the circuit on it’s own is different than the “grand day out” with 1000’s of other riders. If you are in Morzine you can ride Les Gets for an afternoon have a beer and then roll down the road back to Morzine. My top tip for a great lunch is Mont Caly above Les Gets, once small restaurant with truely outstanding view, great food away from the bustle of the resorts. Can return to Les Gets via Dans Le Gaz easy black or red/blue routes.