The best things about packing for a long weekend via car instead of via plane:
1) I scoff at your 3.4 oz. liquids-and-gels limit. (Two years ago, a TSA agent tried to take away my mascara, claiming it was a liquid. I nearly caused a breach of national security while defending my right to feathery lashes.)
2) I can pack four pairs of shoes for three days, and no one will roll their eyes at me when I have to check a bag due to my extravagant footwear needs.