We decided that a ride on the London Eye was in order, and that a Champagne Flight would be even more fun. For £35.04/head (nothing like being EXACT!) you get into a pod with a waiter and a cooler full of Pommery champagne, there's some orange juice for Bucks Fizz if you'd rather. Your ticket gets you a ride on the Eye and a flute of champagne. The waiter is around to take your photo or answer any questions you might have, ours was a cheery chappy and very helpful. You can buy a second glass ticket if you'd like, but I think one glass was enough for the ride.
Normal ride tickets start around £19.98 (again, get those last pennies!), and everything is cheaper if you book online and in advance. Another bonus of booking online is that you can choose a time slot and you're not waiting in the huge lines with the people who've just turned up on the day.
There's also a fixed camera on the outside of the Eye that snaps a picture of you as you're just about done, so make sure you get into the photo zone (it's marked on the floor) as you're on the descent and do your best smiley face. You can buy the photos at the bottom straight away.
EDF Energy London Eye
Westminster Bridge Road
London SE1 7PB