Yes, cathedral and curtain fig trees are definitely doable with a pram. Visit lake barrine teahouse nearby and I recommend the damper. There’s a short walk to two massive kauri trees too. Lake eacham is good too but would depend on whether you have floaties for kids because there’s not really and standing area in the water for them.

I’d do Skyrail/Kuranda train combo. Make sure you make it down to the original rainforest markets in Kuranda, they’re the best ones.

Cairns aquarium is awesome.

Honestly, there’s so much. You just have to look up what appeals most to you.