There are plenty of things to do in the great outdoors in the summer but, sometimes, you just can’t beat a soft play centre. If your kids are starting to climb the walls after a few weeks off school, these are five of our top picks for a day indoors at some of Kent’s best soft play spots… THE FUN DRUM, Gillingham It’s one of Kent’s oldest indoor play centres, but the Fun Drum in Gillingham underwent a shiny new makeover last year. The refurbishment included a 150 sq m Nerf battle arena, a new soft play extension, nine different immersive zones and an arcade corner. There’s also space for paren…