We've booked a long weekend in Sunbury for late May. Plan to do Windsor, Twickenham (for a match), Kew Gardens and central London on consecutive days. Other than central London we'll be travelling there and walking around. Central London we will be hopping on and off the tube but probably no more than 2 or 3 journeys within zone 1
What's the best (cheapest) option for travel. Oyster? Daily passes?
There are 2 adults and an 11 year old.