If you’re visiting San Antonio in the summer, try seeing something at the Arneson. Built by the Work Projects Administration (WPA) in 1939 as part of architect Robert Hugman’s design for the River Walk, this unique theater has a stage on one side of a narrow section of the river, with seating on the opposite side. Most of the year, performance schedules are erratic and include everything from opera to Tejano, but summer brings a stricter calendar: The Fiesta Noche del Río takes the stage every Friday and Saturday from May through July, and the Fandango folkloric troupe performs on Tuesdays and Thursdays in June and July. Both offer lively music and dance with a south-of-the-border flair.