Spend some time at Samar Archaeological Museum and learn about past civilizations. Who knows, you may even discover some unusual traditions and beliefs you never even knew existed.
You're spoiled for sightseeing choice in Calbayog. Samar Archaeological Museum is a great place to start here, but there are plenty of other interesting spots to check out. St. Peter and Paul Cathedral, Cardinal Julio Rosales Plaza, and Danao Cave are not far from the exhibition of human history and will top off your day nicely.