We usually don't do much. Traffic is always ridiculous... too many tourists! And besides that it always rains here labor day weekend, and so far it looks like rain in the forecast again! So we usually just enjoy the 3 days off doing things around home!
We always go to church because there's a blessing of tools - I bring all my teacher supplies to be blessed and then there's a picnic afterwards - then I always watch the end of the Jerry Lewis telethon to see how much he raised and to hear him sing "You'll never walk alone" - then I know I'm ready to go back to school the next day.