Kayak the Thames

Thames River Adventures (32 Whitmore Close, London N11 1PB, U.K.; phone 020 8361 3009 or mobile 07773 720 860, www.thamesriveradventures.co.uk) offers kayak and canoe trips along the Thames, April through October. 2009 prices run £50 (near $136) to £99 ($175), depending on duration (two to 4½ hours).

The company also runs 3-day guided kayak or canoe tours from Oxford to London in September and October.