Might be worth picking up a copy of Days out Guide from the station if you are traveling by train and more than 1 person going 2 for 1 entry to loads of places including Chelsea Physic garden, Eltham Palace, Kew Gardens. Days Out Guide - 2for1 London Most of the places dont accept oyster cards, need a rail ticket they can check. and London open house is 18th and 19th September.