Hyde Park is home to London's oldest boating lake, and visitors can take out a pedalo or rowing boat to admire the many interesting waterfowl that call it home (as well as the brave swimmers in the unheated Serpentine Lido). The boats get very popular in good weather, especially at weekends, but the lake's spacious so once you're out there you should find plenty of room to sail.
Price: £12 per adult per hour (£10 for half an hour).
Open daily 10am-6pm April-May; 10am-7pm June-August; 10am-8pm June-August; 10am-7pm; 10am-dusk October-March.