Nouns

(n)field day, outing, picnica day devoted to an outdoor social gathering
(n)cinch, breeze, picnic, snap, duck soup, child's play, pushover, walkover, piece of cakeany undertaking that is easy to do“marketing this product will be no picnic”
(n)picnicany informal meal eaten outside or on an excursion

Verbs

(v)picniceat alfresco, in the open air“We picnicked near the lake on this gorgeous Sunday”