1st-time London visitors seek fun, culture and bikes.

On a more serious note I'd defo recommend taking a weekend stroll on the Southbank from Waterloo to Tower Bridge. Take in some great sites and offers some decent galleries, exhibitions, places of history/interest etc....The Hayward, Tate Modern, Borough Market, Clink St Prison, London Dungeon blah blah.....

then go for a ride with me as i live less in a 5-7 min walk from all of those places. hurrah for yuppie-dom