San Antonio's River Walk is located almost next door to the Alamo.  

There are stairs leading down to it from the streets downtown or you can go through the River Center Mall where you can exit the mall and get right on a tour boat while enjoying live entertainment at the outdoor cafe.  The tour boat is the best route to take to see the beauty of the River and the fantastic architecture of the historical buildings visible from the tour.  Along the River Walk are plenty of shops and restaurants with both indoor and outdoor seating, making it one of the favored spots for tourists and locals alike.  Attractive and exotic landscaping is a bonus.