The community narrowboat called Angel II takes either community groups or private groups on tours of the canal. You can sleep up to twelve but it's nicer with less. It's based in Angel, near the tube. The skipper will take you either west through the Islington tunnel up to Camden and through London Zoo and Little Venice, or east to Broadway Market, Victoria Park, The Palm Tree pub in Bow and so on. You can turn up the Hertford Canal and go up to Hackney Marshes too.
There is a great wealth of history in terms of the industrial revolution and the various types of architecture but also the canal provides a welcome corridor of nature right through the centre of London. At 2mph it's an easy pace and you will learn how to do the locks and steer the boat. You can do an evening, a day or a week. It's self-catering.
Along the way is the London Canal Museum and various lovely old pubs. The Islington tunnel is 886 metres long - it's very impressive. Bring a nice bottle of wine and cruise through some of London's finest history. It's so peaceful.
www.acct.org.uk/
just off Graham Street N1, by the City Road Basin, it's just down from Angel Tube.