It's small compared to castles at Osaka and Odawara, but at 200 yen, the price is right. There is almost no English in the museum, which is usual for the more off-the-beaten-track castles, although the brochure is available in Chinese and English, and at least the English one seems to have been proofread.

There are what appear to be volunteers around the museum who are only too happy to go into more depth with visitors on any of the exhibits, but, of course, you're unlikely to find one who can speak English, which is too bad, but can't be helped.

The grounds are lovely, and the stonework leading up to the castle (which I gather is original, unlike the castle itself, which is a scaled-down reconstruction) is wonderful to see. Given the ease of reaching the site from Hamamatsu's main station, and the price (200 yen, children free) it's certainly worth an hour of your time.