My son hunted up and down exploring various places, while my daughter found some flowers.
It was a day off with warm weather so I let my children play outside for the first time in a while.
「男の子はあちこち探索して、そして女の子は花を見つけました」 =>
"My son hunted up and down exploring various places, while my daughter found some flowers."
探索する = explore, search, hunt
あちこち = here and there; up and down
various places = いろんなところ(で)
"It was a day off with warm weather so I let my children play outside for the first time in a while." =>
「休みの日が暖かかったので久しぶりに外で遊ばせた」