Here's a (fairly full) itinerary for a nice summer day in London, based in Greenwich and featuring some aspects of the maritime history of England:
* Take the Thames ferry to Greenwich. Or otherwise arrive at Greenwich, but taking the ferry from, say, Millbank or Embankment allows you to see London from the river.
* Wander around Greenwich Market. Grab a takeaway lunch at the market and eat it on the lawn at Greenwich Park.
* Walk up the hill and walk around the Royal Observatory grounds. Straddle the Prime Meridian. Maybe see a planetarium show. The time ball on top of the observatory will fall at 1pm daily, if you happen to be there at that time but no need to go out of your way for this.
* Read about the "Longitude Act of 1714" (https://en.wikipedia.org/wiki/Longitude_Act) and the prizes offered as part of the Act to incentivize the invention of a clock that keeps accurate time at sea, which is needed to measure a ship's longitude. Pendulum clocks don't work very well on a ship! Visit the museum at the observatory, which has some of the early attempts at devising a clock to keep accurate time at sea. Some of these are fairly bizarre.
* Depending on how much time is left in the day, there are other things around the park, including a flower garden and an art museum, but if you want to continue the maritime theme then walk back down the hill toward the river and visit the National Maritime Museum.
* At this point you will be near the ferry dock on the Thames or near the DLR, where you can get anywhere in London for dinner.
Here's a (fairly full) itinerary for a nice summer day in London, based in Greenwich and featuring some aspects of the maritime history of England:
* Take the Thames ferry to Greenwich. Or otherwise arrive at Greenwich, but taking the ferry from, say, Millbank or Embankment allows you to see London from the river.
* Read about the "Great Tea Race of 1872" (https://en.wikipedia.org/wiki/Great_Tea_Race_of_1872), then look at or tour the Cutty Sark (clipper ship).
* Wander around Greenwich Market. Grab a takeaway lunch at the market and eat it on the lawn at Greenwich Park.
* Walk up the hill and walk around the Royal Observatory grounds. Straddle the Prime Meridian. Maybe see a planetarium show. The time ball on top of the observatory will fall at 1pm daily, if you happen to be there at that time but no need to go out of your way for this.
* Read about the "Longitude Act of 1714" (https://en.wikipedia.org/wiki/Longitude_Act) and the prizes offered as part of the Act to incentivize the invention of a clock that keeps accurate time at sea, which is needed to measure a ship's longitude. Pendulum clocks don't work very well on a ship! Visit the museum at the observatory, which has some of the early attempts at devising a clock to keep accurate time at sea. Some of these are fairly bizarre.
* Depending on how much time is left in the day, there are other things around the park, including a flower garden and an art museum, but if you want to continue the maritime theme then walk back down the hill toward the river and visit the National Maritime Museum.
* At this point you will be near the ferry dock on the Thames or near the DLR, where you can get anywhere in London for dinner.
You'll have a blast. To slightly misquote Samuel Johnson, if you don't love London, you don't love life.
I'd put Hampton Court Palace on the list.
Fortitude bakery is the best bakery I’ve ever been to anywhere in the world, highly recommend
The Burghers of Calais, just south of Westminster
https://maps.app.goo.gl/HXvTqKRYUMx8qpbe8
Covent Garden, just north of the Strand
https://maps.app.goo.gl/2pVAJHgjeRFJgSru7