We went on two tours, a half-day walk to a waterfall along the beach and past the argon trees, and then a few days later, the bird-watching tour. Both were led by Ottmane, who speaks English and French. He is an excellent guide, very informative, friendly and good with different members of the groups including a couple of young boys who came with us to the waterfall. For me, these two walks were the highlight of our time in Essaouira and I count taking my shoes off and walking in the sand dunes by the ocean as the top moment, even in amongst all the carpet and pottery buying. Highly recommended.