Plays tennis on the clay courts at the Quad Club in warm weather, indoors at Bally Total Fitness on 47th Street during the winter.
If you have two hours in Hyde Park: "You can't beat the Hyde Park area for books." Personal favorites: Powell's Used Books, Seminary Co-op Bookstore.
If you have two days in Hyde Park:
Visit Frank Lloyd Wright's Robie House. Tour Jackson Park and Osaka Garden. Walk past the Stein Building at 5825 Dorchester. "A lot of the great professors lived there: Chandrasekhar, Saul Bellow, Jim Cronin, Milton Friedman, George Stigler—that's five Nobelists right in one building."