The whole area is built on Top-Hard coal, 500 feet below the surface (the colliery was on the corner of Torville Drive) and there is some subsidence in the local area, parts are marshy, the lake is tipping and the Industrial Museum pump engine isn’t just an ornament –
The Industrial Museum is open every weekend now and in steam once a month. The Hall is open daytimes, the coffee bar is excellent there’s an Ice Cream van in the two main car parks most days plus a bouncy castle at weekends.
There are Pubs, Restaurants, more Coffee Bars, Take Away and delivery food places (its possible they would deliver to the park) and supermarkets for picnics nearby, you will definitely want a rug or something to sit on if you have lunch or dinner on the grass. There are lots of benches in the formal gardens. It’s ok to take the cafe specials out into the park if you tell them you would like to. Their take out coffees are awsome and reasonable.
The squirrels won’t help themselves to your picnic unless you leave your food unattended…