When I read about the trip Marie et Johann Loaëc made by public transportation from Dakar to Brest I am really tempted. It's great reading about the experience others have traveling to Dakar from Rabat. Kite surfing at Tan Tan plage seems like a great idea. Look at these pictures at this beach half way to Dakar.
Would be great to find out more on how easy it is to drive from Rabat to Dakar. If you look at the map it seems like there is a very normal road.
If you have a website that gives some information about a trip to Dakar, you can post it below. Just like this oneabout a trip to Banjul in a VW golf.