What tickets should I buy before I go? What am else should I add?

Maybe throw in the National Gallery of Art, if you would enjoy seeing some of the world's great art.

The British Library is free- and has wonderful collections of artifacts like sheet music- letters from Mary Queen Of Scots- tiny books and Bibles- The Gutenberg Bible- The Diamond Sutra- and more- its fabulous!!

Happy Travels✨💫

I booked theatre tickets for my visit in September. Going to London to see Hamilton of all things.

That's a lot of things to pack into 3 days. I would really prioritize and aim for one maaaayybbe two "big" sites a day, and make sure to build in breaks to keep everyone's spirits up. British Museum is not air conditioned and could be really hot and stuffy that time of year, so I would go there first thing in the morning.

If you're going to Globe Theater, Borough Market is nearby and is a good place to get lunch or a snack.

My son loved doing a boat tour on the Thames. It's a good break from all that walking while getting to see the city from a different perspective. And they sell beer on board (for not crazy expensive), so parents get a break too :)

If you're choosing between St. Paul's and Westminster, I personally prefer Westminster because of the history, but your kids might prefer St. Paul's for the dome climb. Tickets ahead of time for Westminster are crucial, St. Paul's I think you'd have no problem buying on the spot.

Also if your kids are into playgrounds, there's a good one near the London Eye called Jubilee Gardens Playground. It has lots of rope structures for climbing and might be good for older kids. Our kiddo also really liked splashing around in the Princess Diana Memorial Fountain in Hyde Park and the Diana Memorial Playground, in adjacent Kensington Gardens, can get crowded but also has stuff for older kids.

Have a great trip!

You might consider a Thames river cruise. It's an scenic way to get from the Tower to the Westminster area.

I have been to London a more than dozen times and I still am finding new and interesting things to do along with revisiting some of my favorites, you and your girls will have a lovely time. To help you in your planning, I can highly recommend the Rick Steve’s London book, it will help you narrow down your options and help you plan your visit. You have already received some good recommendations from the forum, here are some of my suggestions.

• You will need to purchase the Westminster Abbey, Buckingham Palace, Tower of London tickets in advance to avoid long lines. If you are going to a performance at the Globe, then advanced tickets are also advised. I am not sure whether you will need advanced tickets for the Eye.
• If you are planning to visit Buckingham Palace and see the changing of the guards, you will need to allocate a lot of time. Here is the link for the schedule/location: https://www.householddivision.org.uk/changing-the-guard-calendar. To get a decent view, you will need to arrive early. I would plan on visiting Westminster on the same day as they are relatively close to one another.
• Westminster Abbey is amazing. I would choose one to visit, either St. Paul or Westminster and for a first time visit, would choose Westminster: Depending upon your interest in history and whether you take a tour, you can easily spend an 1 1/2 here. On my last trip in December, my husband and I took the Verger’s tour and it gives you a great overview of the Abbey. https://www.westminster-abbey.org/visit-us/guided-tours. With a verger, you’ll get to see special parts of the Abbey, such as the Tomb of St Edward the Confessor, not accessible to general visitors. The verger will also take you to see Poets' Corner, royal tombs, the Lady Chapel and the nave – and provide an expert commentary. If you are truly into history, you will like the Queen’s Jubilee Gallery, but I think it would be a bit much for an 11 and 14 year old.
• If you are going to the Globe, you are close to Borough Market. It is one of the oldest markets in Britain and a great place to get local food and they even have demo classes. Check on the link for the hours and events;http://boroughmarket.org.uk/.
• Natural History museum: I have been to many around the world and I like this one, my advice is to go early and hit the dinosaurs first. It can get really crowded. The V&A is a few minutes walk and one of my favorite museums. It is free, so you can pop in if you have time. This is also a great place for afternoon tea.
• If you have the time and interest, seeing a play on the West End is also a highlight of London for me.

Finally, I would check out the Visit London app. I used this to help me plan my trip and to better understand special events happening around the time I visit.

Enjoy London and have a great trip.

Thanks for the feedback, I will probably skip St. Paul's and my daughter was the one who wanted to see the Globe so maybe we do that and get some food in the Burroughs.

I'm looking at these speed boat tours on the Thames which look like they would be fun, anyone had experience with them? Are they good and worth the money? Is one company any better than another?