We tent camped with our 4 kids (15,13,10,7) for 2 nights at the Key Largo Kampground. The staff was very helpful and made sure we had a larger site in order to fit our 2 tents. Our site (13) had electric (handy for charging electronics), one of the communal sinks, a charcoal grill, a picnic table, and room to park our minivan. The site was shady and there was a nice breeze the entire time we were there. The sites are right next to each other but from what I understand that's pretty common for tent camping in the Keys. The only 'bad' thing about our site was the street light. It wasn't super bright but if you wake up in the middle of the night you might think the sun is starting to rise. ;)
The bathhouse by the main office is older but was very clean. There is a wifi hot spot with electrical outlets if you need/want it behind the main office. The pool was closed the day we arrived because it needed a thorough cleaning (chlorine shock?) due to some late night revelers. We were gone the next 2 days so did not get a chance to use it but it looked nice. There's a playground for the younger kids. We checked out the beach closest to the canal. The kids weren't too keen on swimming because of the grass but it looked like a nice place to take kayaks.
Overall, the campground was nice and the price was budget friendly. Everyone we met was super nice and offered suggestions on where to go/what to see with the kids. I greatly appreciated the quietness at night and how safe the area felt. If we head back down to Key Largo for another vacation, we will definitely stay here again!