The London Pass

Worth the money if you plan out your day to get to several stops in per day.

The only trouble we had was the tube tickets from the airport. Our flight arrived early in the morning and I had to purchase additional tickets since our transportation option (additional fee) included tube tickets but not for the early morning from the airport - so our party of 6 had to each buy a one way ticket out of the airport. Rather disappointing - and costly mistake for a party this size. We managed to get to a few stops per day - 2 day pass and probably saved a little money but if we had planned out the day better we could have seen more. I think I would purchase it again for a future trip.