Enjoy two of the uk capitals top activities in one day on this st pauls cathedral visit and thames river sightseeing cruise in london hop on and hop off your thames river cruise from any of the four conveniently located piers as many times as you like for 24 hours take in famous landmarks including big ben the houses of parliament the london eye tower bridge and the tower of london then explore the crypt of st pauls cathedral and enjoy panoramic city views from the golden gallery