Victoria Park, Widnes
Widnes's flagship park with a summer splash pad, big playgrounds, a skate park for older ones and a bandstand cafe. The local free default, minutes from Catalyst.
Catalyst Science Centre
Widnes, Cheshire
A hands-on science centre in a former chemical works, topped by a glass observatory with views up and down the Mersey. Small enough to do properly in two hours, cheap enough to repeat.
It is the thinking-family's wet-morning option: interactive galleries below, the rooftop as the finale, and Victoria Park's splash pad five minutes away if the sun appears.
Looking for more museums & science near Widnes?
Also in Widnes
Spike Island
A man-made island between the Sankey Canal and the Mersey, reclaimed from the chemical industry into flat riverside parkland with big skies and boats to watch. Free parking, next door to Catalyst, and yes, it is where the Stone Roses played in 1990.