If the weather's not playing nicely, why not spend the day at Bardo Museum? You'll be fascinated by just how many interesting facts you can discover about the past here.
When you've finished at this Bardo collection of historical artifacts, why not check out Habib Bourguiba Avenue, Carrefour Market, and University of Tunis El Manar? They're not very far from Bardo Museum and also a favorite with tourists.