We'll be staying at the Well-i-Hole campsite in Greenfield. It's £8 per person per night for a 1-man tent.
For climbers, there are some excellent gritstone crags nearby, eg. Dovestones and Wimberry Rocks.
I'm sure the walkers among you will enjoy exploring this lovely part of the South Pennines. This site may help with planning/inspiration: https://www.hikideas.co.uk/walk-saddleworth.html
Fans of Last of the Summer Wine can visit nearby Holmfirth and have a nice cup of tea in Ivy's Cafe. Pensioners sliding down the hill in a bath cannot be guaranteed, however.