Right on my doorstop, we often go to Newstead Abbey - running or walking - it is a beautiful part of the world. Highly recommend the gardens for an exploration, they are truly beautiful and so well managed. The house is also well worth a visit. The last time we did this (February 2020) the volunteers were just absolutely amazing - sharing knowledge, stories, answering questions. I personally could have spent all day listening and learning :-) It's an amazing bit of history - ask about the ghosts :-)
The little coffee shop is great for snacks too - picking up a coffee and a local sausage roll, just really lovely.