Built for the 1968 HemisFair, an exposition celebrating the 250th anniversary of the founding of San Antonio, this urban oasis boasts water gardens and a wood-and-sand playground constructed for children (near the Alamo St. entrance). Among its indoor diversions are the Institute of Texan Cultures and the Tower of the Americas. Be sure to walk over to the Henry B. Gonzales Convention Center and take a look at the striking mosaic mural by Mexican artist Juan O'Gorman. The Schultze House Cottage Garden, 514 HemisFair Park (tel. 210/229-9161) is also worth checking out for its heirloom plants, varietals, tropicals, and xeriscape area. Look for it behind the Federal Building.