One tip I picked up in a book I recently read. Make sure your supension and tires are rated for the load of 4 passengers and all your gear. You can get heavier duty tires and springs/struts to compensate for the sag of a stock suspension/weakenss of light weight sidewalls. The car will handle better and you won't "cadillac" when you go over bumpy terrain.
keep your windshield washer fluid full - (I take a scrubbie/squeege with me - clean often and have better pictures thru the windows as sometimes its all you can get)