If you like haggling for the best price, you might want to head out to Place R'cif in Fes El Bali and take in the atmosphere. Splash some more cash at Chouara Tannery, Henna Souk, and Sidi Moussa Tannery.
If you like art, you might want to browse the collections at Talisman Art Gallery in Fes El Bali. If you want to experience more of the culture Fes has to offer, head to Kairaouine Mosque, University of Al Quaraouiyine, and Zaouia Sidi Ahmed Tijani.