I was pretty fortunate in that there were only 4 days where it was too wet to descend safely in the Pyrenees and Alpes. Scenery is indescribably beautiful and the local people very accommodating. The only downside was a crash in the Pyrenees where I landed heavily on my shoulder (Doctor deferred x-ray as I had reasonable mobility in the joint ) that meant I was eating 200mg of neurophin and 2g of codeine a day so I could climb out of the saddle. Also experienced a near miss with an oncoming RV which saw me holeshot between the RV and the guardrail on the wrong side of a hairpin bend after I braked waaay to late and overcooked the corner.
I am 74kg and I was able to hit 87kmph on some descents. If I was a little braver I probably could have cracked 100kmph. The absolute highlight for me was descending through several dimly lit tunnels in the Alpes at 70kmph. Super scary the first few times then a super rush thereafter. Next year I am taking a bike running disc brakes and a extra set of alloy rims for some of the longer descents