In reply to Owen W-G:
Peak district mines museum in Cromford
Speedwell cavern
Chatsworth house gardens & farmyard adventure playground
Buxton swimming baths/ pavilion gardens
Carsington water (bike hire, Canadian canoes, bird hides)
Ilam hall gardens & tea rooms/ Thorpe cloud/ bunster
Tissingon pony trekking
Monsall trail
Bakewell
Check to what's going to be open