One of the places she recommends is Brockhill Country Park, Hythe.
"The kids can really roam free," she said. "It's massive - even when it is the school holidays you can find a corner for yourself, there's a stream, places for the kids to climb and roll down hills."
Mrs Smith also includes Kearsney Abbey Gardens in Dover on her list.
"There's a big lake, it's very pretty, loads of open spaces; huge fields to kick a football around and have a picnic," she said.
A third place to enjoy in Kent, according to the Frugal Mum list, is the award-winning Mote Park in Maidstone.
It has 450 acres of grassland and woodland, as well as a 30-acre lake, a river, pedalos and high ropes.