Tokyo was once a city of canals, and while few remain, a tour of them is a fascinating way to see the city from a different vantage point. Outdoor sports club Zac runs 1½-hour kayaking tours along Kyū-naka-gawa (actually a canal) on Tokyo's far east side. Choose from day or night tours and book online. Guides speak basic English.
Children aged six years and over are allowed to join (kayaks seat two). Solo travellers can book for an extra ¥1000. Life jackets provided; see the website for instructions about what to where.