The best mode of transportation during your trip is via the London Underground, also known as the Tube. Purchase an Oyster Card for £5 and top it up with credits so you can easily travel to and from different locations within the city. Download maps and schedule apps such as Citymapper to guide you around. Expect to spend approximately £10 for transportation costs and around 20-30 minutes traveling between each attraction.
If you have more time, consider visiting other attractions nearby like the Houses of Parliament, Big Ben, or the National Gallery. You can also take a relaxing stroll at Hyde Park or catch a show at the West End theaters. On the other hand, if you have limited time, consider skipping a few attractions and focus on what interests you the most.