depends on whether u drive or not. If you drive just go kukup. you'll have a good time there just for a day.
If not KSL vicinity got alot of nice food , walkable to alot of entertainment around the city, also mall outside monday got pasar malam. Bluntly said, its a tourist trap but dense, alot of things to do but just have to be xtra careful dont get chop
Sutera Mall is aslo good, bus friendly if you stay in the west, Go Kart, Escape, lots of hipster like establisment around the mall. Its a place where Johoreans spend their sgd here