Something fun to do in London on Saturday?

[SmiledWithTheRisingSun]

Looking for a fun activity to keep all ages (5-40yrs) entertained during the day / early evening this Saturday.

Any suggestions?

Depends on the weather. Successful trips we’ve done have included

Taking bikes and cycling from station through Green Park, Diana memorial to Harrods for a browse

Mooch along the SouthBank sometimes take in a show at the centre

Myriad museums and galleries. We liked the National Portrait Gallery and Tate Modern best

Further out have had good days in Greenwich - market & park, and in the summer at the Olympic Park/Westfield