How this fits in with a picture of spring and children playing, I leave to you. I do not intend to dictate an interpretation as if it were gospel. But that should neither faze nor discourage you. The fact is that all readers are equal before the text of the poem. No one was born with a sure knowledge of the embedded levels of meaning of a poem, not even professors of literature.
Validity is all.
Explicating, like teaching itself, takes practice. Over a period of time, your insights will deepen, your self-confidence will strengthen, and your enjoyment will increase. Let your ingenuity and imagination fly. They will lead you to intellectual challenge, emotional satisfaction, and wondrous appreciation of the craft of poetry. Yet, never, in Extremity, It asked a crumb of Me.