If your trip to Alcala de Henares is all organized but your itinerary is a little on the empty side, let us give you a few hints and tips.Plan a stop at La Garena Plaza Shopping Center. It's one sight you'll find on many travelers' must-do lists. If you still have space on that schedule, Convent of Las Clarisas de San Diego and Cervantes Birthplace Museum will keep you occupied too.