If you are in and out through Morocco, then your 'round trip' options are very limited.
There is no crossing from Morocco-Algeria.
You will not be able to avoid going down and then back up through Mauritania - although once in Mauritania you can do Atlantic route one way, and train-line the other - so different!
Why don't you look into shipping out of Banjul, and then making your loop out through Mali before returning to the Gambia and flying back.
The only other option (which is the best one - other factors aside) is down through Morocco, and up through Algeria and Tunisia.
Sam.
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