I often fancy dropping into Kew Gardens or even just Kew Palace when I look across from the towpath but a visit usually costs £16. This means that you will feel that a full day is required to justify the price. I can recall when entry was one penny.
It will be like that again during the Christmas holiday because there is to be free entry from Saturday 22 to Friday 4 January.
Booking online starts on Monday 17 December.