Sunday's - everyone is with their family or bf/gf relaxing.
Saturday night's - everyone is out having fun and socialising
Saturday daytime - people are out shopping/lunching/beaching/sporting (i know these aren't words haha) with their friends.
Monday-Friday - people are chatting to people at work/sending joke emails and talking about their plans for the weekend.
Every day is the worst day....but i also agree with your 3