A pastime was a common way for individuals to spend time.
Baseball was once considered the national pastime of the Americas, until an impatient society demanded faster sports. (TNG: "Evolution")
Though not a professional athlete, Miles O'Brien considered racquetball to have been a serious pastime of his for many years. (DS9: "Rivals")
In 2374, after Seven of Nine noted that Chakotay's face became flushed while speaking to Kellin and wondered why, Tuvok suggested not speculating, as he found it to be a "dangerous pastime". (VOY: "Unforgettable")
In 2375, Tom Paris noted that theft seemed to be a local pastime on Noss' homeworld. (VOY: "Gravity")
In 2376, Neelix was aghast at the Norcadian sport of tsunkatse, saying he couldn't believe their favorite pastime was "cheering while innocent people fight each other". (VOY: "Tsunkatse")