An amazing place to visit. I would suggest you visit the Museum of Computing first, which is in the same grounds, as there are men explaining the workings of the machines and it will make more sense when you go round Bletchley Park. The huts were very interesting showing the working conditions which were very uncomfortable. The whole place was mind blowing and you really need to go back to take it all in. The grounds are very nice and you can take a picnic. If you are planning on staying the night, I can recommend the Holiday Inn Express in Milton Keynes. A very comfortable hotel.