My roommate's family took me to the classy Casa de Bandini in Old Town's Bazaar del Mundo sometime in college, and it is probably one of the most festive dinners I have ever experienced. Patrons head to one of various bistro tables to enjoy drinks while waiting for their table. There is plenty to see, with the building being a large previous home that has been preserved as a historic landmark. Dinner is served in three elegant dining rooms or the beautifully decorated central courtyard filled with trees, music, and flowers. I highly recommend their margaritas.
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