If you'd love to inject a little more culture into your trip, put Bung Karno Museum and Library on your to-do list. Check for guided tours or just look around at your leisure.
You'll have no end of sightseeing choices when spending time in Blitar. Bung Karno Museum and Library is an ideal place to begin here, but there are loads of other fine sights to check out. Blitar Square, Penataran Temple, and Sumber Udel Water Park are close to the museum and and will cap off your day nicely.
