Snowball wars with snow forts and full-on ambushes (street vs street) , snow men, snow angels. Washing your hair in snow. Making snow cones our of REAL snow. You dont' want to get hit with an ice ball, though. Those HURT!
Police disperse hundreds in brawl in Kafr Manda, northern Israel (Haaretz)
from the article: Nine Palestinians arrested for pummeling ultra-Orthodox with snowballs