Northern Valley Sports Academy (NVSA)

If you’ve got a toddler who needs to burn some energy indoors, this Closter spot is worth knowing about. The PlayBox area is genuinely well-kept — slides, climbing structures, the whole setup — and it’s enclosed, so you’re not chasing anyone across the room every five minutes. Benches and shaded seating mean parents can actually sit down, which, let’s be honest, matters. Older kids aren’t left out either, with a basketball court and soccer field on-site to keep the 12-and-under crowd busy. It’s also become a go-to for birthday parties in Bergen County, and you can see why.