See the best that englands capital has to offer on a full day city tour of london after an early access visit to the unesco listed tower of london to see the crown jewels and more watch the must see changing of the guard ceremony outside buckingham palace sit back and relax on a sightseeing cruise down the river thames and then explore st pauls cathedral with a guide if you want to see even more upgrade to one of two must do activities an afternoon tea at westminster park plaza or a lon