Best thing we did in London

We did a four hour bike tour with Ceri. There were 10 of us, two grandparents, 4 grandchildren aged 13,14,15 and 16 and their parents. We used our London Pass to book. Everyone said of all the things we did in our four days in London, this was the best.
We felt safe and saw so much of the city, thanks to Ceri our guide.