London trip for free by eiskje
Take one of the red buses. Look at the map and see if there's one that takes you all around town, without it being an official tourist bus. It used to be bus 159. If you sit on top you can see a lot of the famous buildings without taking a step and for the regular price of a busticket or even better a one day travelpass.take the top seat all the way in front and just relax, make sure you get off before your zone expires. Also a trip by buss from the London Tower towards Trafalgar square is a good trip to take. have fun!