If you like live theater productions, book yourself a ticket for a play or other stage show at Biwako Hall. Check online for prices and times.
This Otsu arts and culture attraction is an interesting spot to kick off your day of sightseeing. There's lots to explore close by, including Kiyomizu Temple, Fushimi Inari Shrine, and Heian Shrine. Take your time at Biwako Hall before hitting up these other fine sights.