We are fortunate enough to be about 5 minutes from one of the National Trust sites, Kedleston Hall. It is similar to Chatsworth but probably down a peg in the hierarchy. [They did take pride in the fact that the movie about the Duchess was partially filmed here rather than Chatsworth.]
They did a nice job around Easter in that they had a bunny "hunt" in the forest grounds and a chick "hunt" inside the house. That really makes it more interesting for the kids.
Another benefit of Easter is all the lambs (to see . . . not eat).