project, task, undertaking, labor - any piece of work that is undertaken or attempted; "he prepared for great undertakings"

diversion, recreation - an activity that diverts or amuses or stimulates; "scuba diving is provided as a diversion for tourists"; "for recreation he wrote poetry and solved crossword puzzles"; "drug abuse is often regarded as a form of recreation"

sexcapade - a sexual escapade; an illicit affair