Climb the O2
The O2 Arena is worth a visit (North Greenwich station, Jubilee line).
You can book to climb over the top.
You can find a range of packages and times, and the site details health and clothing requirements. We’re not so convinced by the food option packages.
Technically speaking, you can do this if you are a child. The lower age limit is 8, and there are other requirements regarding height (of the person, not the arena).
We know people love this. Personally, we’d find a place for cocktails, then go on the cable car. Or go to a concert.