Rik
Google
First of all, Don't get stung if you can by parking in the pubs car park, there's one just after it which is half the price but normally pretty full so try to get there early to secure a cheaper spot!!
Hollingworth lake is a great little spot with plenty of activities from Boat rides, Fishing playgrounds for kids and even hides for bird watching or photography.
It took me about 2 hours to walk around completely at a slowish pace talking photos as I went even bumping into a fellow photographer for a chat.
About half way round there's a little cafe with a seating area which is perfect if you take children with you to give them a break.