Here is a list of all the best kid-friendly hikes on Oahu. Many of these you can do with a stroller, too, if you are traveling with infants or toddlers.
Another hike that is stroller friendly and is one of the best waterfall hikes in Oahu is the Waimea Valley Falls. The trail is paved but can get steep in some areas; however, any skill level or age can do this hike.
Another one of the best easy hikes in Oahu Hawaii is the Manoa Falls. This Manoa hike is about a mile and a half long through a gorgeous rainforest where you will see nothing but beautiful greenery all around you.
Kaena Point is another one of the great Oahu hikes that you can do with kids. While this trail is pretty much flat, it is a lot longer than most of these hikes. It is around 2.7 miles one way.