How about this floating bar on the Sumidagawa.
[img]http://smokyo.com/images/bestofimages/article_jicoo.jpg[/img]
You can get the bar on a boat from Hinode pier near Hamamatsu Station on the Yamamote Line next to Shimbashi. The boat leaves every 30 minutes. You can stay on the boat for 3 hours or get off when it gets back to the pier every hour.
The cruise can be a great night depending on howmany people there are on board. It's probably better to go with a few people just in case there aren't many punters on board the bar boat.
They normally have a disco on board or special entertainment laid on on special days.
If you decide to go on the booze cruise, come back and let us know about your experiences.
[img]http://smokyo.com/images/bestofimages/ship350x172.jpg[/img]
Reservations
Tel: 0120-049-490
Boarding Time: 20:00 / 21:00 / 22:00
Business Hours: 20:00 ? 23:00
Prices: Floating Pass: \2500 Yen
Beers: 600 Yen, Cocktails 1200 Yen
Link: [url]www.jicoofloatingbar.com[/url]