Fog delays. You don't have to make up school days at the end of the year, but it basically turns that day into a blow off day where the only full periods are the ones that are during lunch hours - and one of mine was a study hall.
Study halls are quite nice too. Half the time all I do is read.
Cake or ice cream for breakfast. Yum. And you don't feel too bad because it's just breakfast and any breakfast must be better than the none that is oh-so frequent.