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There are buses to take you to the chateaus from Tours Gare and cost around 49 euros per person for a full-day tour- you'll visit Chenonceau, Amboise then Chambord which is quite a lot in one day.

While I would recommend a full day for each of these attractions, if you haven't the time it's a great day for the whole family and no need to drive or hire a car. Lunch is usually at Amboise which has lovely cafes, nothing really really gastronomic but good for lunch.

You can probably organise tickets for the chateaux pick-up via SNCF (gare) or www.tourevasion.com for more Loire Valley activities]]> http://www.ivebeenthere.co.uk/tips/19617