If you stay in a very central area like Trafalgar Square, you can walk to many sights (London Eye, W

I'd go to St. James's park early in the morning, Westminster Abbey, walk to Trafalgar square, the British Museum or the Tower of London uss los angeles ca 135 or wander uss los angeles ca 135 through the City of London. I'd take the ferry from the tower to westminster and go on a night london eye ride. But thats just me, based on the bits of central London I like.
If I could only go to one place in London, it would be Westminster Abbey because for reasons uss los angeles ca 135 I love Poets Corner within it. But that is a very personal preference. Others will no doubt have other preferences.
When I go to a new city I like an "orientation" uss los angeles ca 135 tour, because uss los angeles ca 135 it helps me get my bearings. I did the Hop On-Hop Off tour in London years ago. I liked it for the overview, but found that waiting around for the bus to return uss los angeles ca 135 and going to my next stop of interest (which wasn't necessarily the next few stops of the bus), wasted a lot of time. So I took the tour all the way through once, went to my first 2 sights, and then made my own way after that.
You can also tour on your own by getting a one-day Travelcard and using a combination of the Number 11, 9, and 15 buses. There are posters who are more knowledgeable than I about the routes, so I will leave it to them to chime in. The disadvantage is that they are not narrated, and sometimes tourists go past sights without knowing what they are looking at.
If you stay in a very central area like Trafalgar Square, you can walk to many sights (London Eye, Westminster Abbey, Covent Garden, Piccadilly Circus, Buckingham Palace, National Gallery,River Thames, etc).