Jemaa El Fna is like a living, breathing creature. And for the uninitiated, a first visit to the main square can be a disorienting experience. But thankfully we received a helpful tip from the manager of our riad. He told us to view the square like a stage and the entire thing as theater. Each character had an act to sell, from the snake charmers to the women who offer to paint your hands with henna. Viewed from this perspective, you won't really get annoyed by the hustle. Instead you might walk away with a new friend. Although if you're truly not interested just give a firm no and walk away after a brief chat.
Getting lost in the labyrinth of alleys of an old foreign town was always something I've loved. The maze of souks in the medina takes this experience to an entirely different level. Leather, metal work, terra cotta pots, spices.. Walking thru the souks is a wonderful assault to the senses. Haggle on the price before you buy anything!