Taking the bus is fairly easy and pretty cheap. Take the #11 from the airport to the main square for less than $1. It's safe. Then to leave Marrakech,get to the bus station and ask for directions. There are tons of buses to Agadir, you can also go to Tiroudant. Buy a ticket for the better, more comfortable bus. It's worth it. A ticket to tiroudant cost $15 per person. Buses run a bit late (half hour) and it's common that they make stops along the way that last between 15-40min. Vendors will come on the bus to sell you candy,water and sunglasses. #transportation