As my last post explains, there are several attractions located inside Ueno Park. Oddly enough, my favorite was this small, oft-overlooked lesson in Edo- and Taisho-period life in the Shitamachi area, from Taito to Chiyoda and Chuo, including Asakusa.
Open it and you see almost nothing. This is the bathroom, similar to American outhouses. The can hanging outside holds water for washing hands, and the towel is provided to dry yourself, of course.
His wife has set out some tea for him after a long day's work.
While the Shitamachi Museum isn't as big or flashy as the Edo-Tokyo Museum, it is a small gem worth visiting while exploring Ueno Park. Admission is cheap (300 yen) and the staff is very nice. Usually, an English-speaking guide is available and she will give you a free tour of the first floor, explaining life in the tenement houses. And she'll show you how to get and read a fortune at a temple! The counter staff were really kind and gave me a little origami spin-top made from a brochure or flier too (which I still have).
The museum is open 9:30 AM to 4:30 PM, but is closed on Mondays. The museum also closes in August and December to change exhibits (which means the houses and their stories can change as well). In 2012, those dates are August 27-31 and December 3-7. As with most Japanese attractions, the museum is also closed at the end of the year (December 29-January 1). Check the English website for any updates on hours, exhibits, and special closures.