inside morocco, best way to travel is buses, connection is good to south, you can go to laayoun, and try to find a ride to mauritania, or you can continue intel dakhla, and take a van for 200dh to nouadibou in mauritania, from there you can take taxis to nouakchott, and then an other one to rosso senegal, from there you will take the BAC, its free, they will try to take money from you, dont give them.
in senegal you can use taxi bross if you like.
you can also try to find a ride when...