A good place to experience Hyde Park’s cross-cultural vibe is 57th Street. There are tweedy academics rummaging through the dusty shelves at 57th Street Books (No. 1301; 773-684-1300; semcoop.booksense.com), and dapper African-American families sharing deep-dish pizzas at Medici on 57th (No. 1327; 773-667-7394; www.medici57.com). Indeed, Malia and Sasha Obama have held pizza parties at this popular Italian restaurant; just refer to the menu, where new “Obama Eats Here” T-shirts are on sale for $18.