In a small town called Tring in Hertfordshire is a branch of the Natural History Museum set up by the Rothschild family. Its fairly easy to find and close to the town centre and has its own car park and a new overflow car park. The museum is free to enter.
Inside there are various cabinets filled with all kinds of birds, fish, corals, mammals, insects and other creatures all of which were collected by the Rothschilds. It is interesting to see the true size of the animals and one of the most striking is the polar bear you come face to face with when you first enter.
There are four floors of exhibits including a small room telling you more about the man whose collection made the museum possible. At the moment there is also an exhibition about Antarctica which is open till the end of August I believe and again is completely free.
Nearby, and accessible through the overflow car park (following signs) is Tring Park which has free roaming cows and sheep and a woodland area with follies, obelisks etc and is well worth a walk around on a sunny day.