I have done Avignon to Nice a number of times. It's a wonderful route. I would suggest touring the Avignon area for a few days, visiting Arles, the Pont du Gard, lex Baux and St. Remy. To head for Nice go out the south part of Avignon,corss the Durance and turn left. Follow the Durance until you reach the Verdon. Turn right onto it and follow to Moustiers and through the Verdon Gorge. The Gorge isw stupendous. Check my website
www.TodMoore.net to get a preview. You could also continue along the Durance and right on the Bleone to reach Digne, Barreme, and St. Andre les Alpes. Either way you come to Castellane, a wonderful town. Leave Castellane on D52 ( map is old, but it's the red road going past the rocher. This will take you to Cannes through Grasse. If you want a really wonderful quiet ride turn left on D21 and right shortly after on D2. On this road after a few K's you go through a "clue" and the world seems to drop away in front of you. From here on in it's downhill all the way to the coast, all the reast of the day. You go along an incredible cliff face to reach Greolieres. Right after the town and down the Loup river gorge. More stunning scenery and not a very busy road, we"re talking. hanging cliffs and incredibled waterfalls. A nearby Autoroute takes the traffic and leaves this road to us. Follow the road straight down. Don't take any turnoffs to the left for Nice, they're too busy. Continue on straight until you come to a "T" which is the railway. Jog 100 yds or so to the left and go under it, keeping up you speed as it's steep down and steep up. Five minutes later youre on the sand at Cagnes sur Mer. Left along the main route where it's pretty busy for a couple of miles and then not too long after the airport a bikeway begins. You come into nice rolling along the Promenade des Anglais, the best introduction to Nice you could possibly have. You're going to love this route. there are camps all along the route and as a single (I presume) you can almost always find a spot. Let me know how it goes.