For traveling within London, public transport and walking are the most reliable options. A 7-day Travelcard can be purchased for travel on buses, the tube, overground trains, and DLR, costing around £40. Taxis are available, but they can be costly and time-consuming due to traffic in certain areas.
If you are short on time, prioritize visits to the British Museum, Tower Bridge, Sea Life London, the Tower of London, and St. Paul's Cathedral. You can also save some money by purchasing entry tickets in advance online. To gain a comprehensive view of the city, take the Thames Clipper Boat Service for a scenic ride. Lastly, remember to always carry an umbrella due to the unpredictable weather of London.