If we could travel back in time a hundred years, we could all attend the Angle Lake Plunge! From the Industrial Worker:

The text reads:
MAY DAY PICNIC AND DANCE
will be held at
ANGLE LAKE PLUNGE
SEATTLE, WASH.
Take South Park Car No. 5 on First Ave., FREE bus fare from end of car line to picnic grounds
SUNDAY, MAY 2, 1926
AUSPICES I.W.W.
Benefit Industrial Worker and Local Organization
SPEAKER: J.P. Thompson
Everybody Welcome
Admission 50c