You could always start off in Central London / Westminster, head out through Chelsea (watch out for the tractors), over Putney Bridge, turn right carry on to where the road splits by a park, take the left one, over the bridge where Mark Bolan died, turn right, carry on, next set of lights turn left, go up the hill in Roehampton, turn left on the cycle path/pavement, carry on, into Richmond Park – stop for some lunch at one of the cafes, do a couple of laps, take Richmond Gates, into Richmond, cross the Thames, turn left onto the Thames Path head out of London, get to Twickenham, head for Hampton Wick, get back on the Thames Path, ride along to Walton on Thames and then carry on towards Eton / Windsor or turn around and head back.
Fair few pubs, great scenery – Hampton Court Palace is awesome – great day if the weather is nice.
BTW it’s also my commute, hence the directions 😉