Q:

What should I do? -- short riddle

First understand that a child now can,
Soar into sky and fly.
To do so is fatiguing, not to the child who is squealing,
With merriment as they enjoy the ride.

For the answer above use the bottom two, put them together and you'll know what to do.
Firstly:
In her land is where you'll be,
Smack dab in the middle of open sea.
Mates down where are pretty gung ho,
Don't check above, don'chya know?

Secondly:
When walking through woods it's good to do this,
Off with their heads yells the queen but she'll miss.
Looks can be deceiving, a docile air,
But get too close and they'll snap at your hair.

A:

 You should under-duck when giving a child a push on a swing.

because... (1)

 The answer to the first is 'swing'.

(2)

 The second answer is 'under'. The clues point to 'Australia' or as they say, 'Down Under'

(3)

 The third answer is 'duck'. The clues point to ducking in the woods, when someone is trying to chop off your head, or the animal.

