I too have qualified, and will be racing. i used to live at the base of the col de vence. I have raced the nice international that went up that course, and have ridden that course many times, as recently as september 2018. firstly, the pavement can be shit at times. secondly, there are 10km of dead flat prior to the climbing starting. the last 20 km are flat. you climb on the side of a hill to get to st jeannet. then after st jeannet to vence, there are a few kilometers that you can drop into your aero bars to get to vence, just slightly uphill. in vence, it is a hard right turn and the 9km climb starts. the first 3-4 kms are the hardest, just to the hard right switch back, then it becomes easier and more exposed. it can get hot with the sun on your back. there are km markers with the elevation. once over the top, the road descends only a few 100 meters, then you are on the side of a gorge, and it is a about 3 km of flat, turn right and you have to climb back to coursegoules. the little climb to coursegoules is only about 400-600 meters, but it really exposes the heavy legs....once over the top, it is a flat out pedaling down hill. this is where you can spin out, and some of the corners come up very very quick. tri idiots will be at risk here. the descent into bouyon is a pedaler, but but i would cautious being in the aero bars. the road is narrow. once in bouyon, there is a hard right after then little village center, then the descent is a bit rough, when i did the Nice international, there was water running across the road at the start of the little descent right before it got real steep, it was a bit nerve racking as the road was a bit rough as well, it still is. at the bottom, there is a sweeping left turn, then a gentle climb out of the valley gorge. lots of time can be lost here because the legs can be so heavily built up with lactic acid from the previous hour. once over the top of this climb, there is a fast pedaling descent to le broc. there are some turns and some long pine needles that can sometimes be in the road from le broc to carros. the road is newer and very fast. once in carros, there is a right veering turn to the road that connects with gattiers. I rode it in september 2018, and it was fairly bumpy, some poor pavement, rather flat, and some quick turns. there is a slight false flat riding up to gattiers. There is a cafe at the round about in st. jeannet with vinokourov's poster, as he used to, or still does, live in the area. I used to see him riding when he was telekom. the descent from gattiers down to the river floor is fast and not technical, only one real hard turn. and then from 75 km on it is failry flat. there can be wind. fyi, I am riding a specialized road bike with very light wheels with clip ons. As well, i am not going to ride fragile tires. I think it will be more comfortable on the climb.
on another note, the run is dead flat, and can get some wind. it is totally exposed. I remember when i raced there, they had no ice, and all drinks were served warm. The swim, the beach is stone, two steps into the ocean and you can be over your head. there can be waves as well. Mid September 2018, the cote d azur was hot and humid. not kona hot and humid, but it certainly was not easy, but then, a storm rolled in, and the locals were surfing in antibes and boats were heading for shelter in the bay at villefrance. I tried to ride, but it was blowing super hard, and riding the coast was near impossible, but inland was possible.